== sanity test 49a: Change max_pages_per_rpc won't break osc extent ========================================================== 13:21:37 (1786036897) osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=165 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=135 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=101 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=216 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=184 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=96 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=103 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=201 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=106 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=231 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=231 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=82 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=114 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=153 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=140 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=59 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=211 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=145 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=244 error: set_param: setting /sys/fs/lustre/osc/lustre-OST0000-osc-ffff927382fdc000/max_pages_per_rpc=3: Numerical result out of range error: set_param: setting 'osc/lustre-OST0000-osc-[-0-9a-f]*/max_pages_per_rpc'='3': Numerical result out of range osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=39 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=67 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=151 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=110 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=85 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=143 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=124 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=42 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=209 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=145 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=67 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=247 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=206 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=64 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=45 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=56 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=40 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=223 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=23 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=195 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=74 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=196 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=118 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=27 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=106 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=141 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=65 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=125 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=90 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=256 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=97 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=182 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=122 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=58 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=115 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=43 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=215 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=155 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=29 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=108 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=231 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=56 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=159 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=24 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=88 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=212 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=243 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=120 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=88 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=128 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=125 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=90 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=138 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=18 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=30 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=159 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=34 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=74 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=249 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=52 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=33 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=19 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=159 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=92 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=170 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=160 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=124 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=117 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=193 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=25 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=170 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=39 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=135 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=79 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=137 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=59 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=200 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=43 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=92 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=207 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=95 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=16 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=85 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=63 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=195 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=106 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=57 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=22 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=172 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=127 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=223 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=163 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=161 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=29 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=56 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=22 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=217 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=104 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=252 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=117 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=33 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=51 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=254 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=168 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=124 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=139 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=218 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=130 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=77 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=167 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=46 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=133 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=223 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=21 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=130 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=185 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=164 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=59 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=180 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=221 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=147 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=42 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=228 error: set_param: setting /sys/fs/lustre/osc/lustre-OST0000-osc-ffff927382fdc000/max_pages_per_rpc=7: Numerical result out of range error: set_param: setting 'osc/lustre-OST0000-osc-[-0-9a-f]*/max_pages_per_rpc'='7': Numerical result out of range osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=121 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=245 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=198 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=187 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=98 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=140 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=180 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=24 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=160 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=72 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=59 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=248 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=149 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=125 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=127 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=20 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=29 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=162 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=192 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=254 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=138 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=88 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=69 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=87 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=163 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=180 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=103 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=230 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=130 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=218 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=243 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=149 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=76 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=131 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=187 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=101 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=186 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=32 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=249 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=68 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=98 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=176 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=28 error: set_param: setting /sys/fs/lustre/osc/lustre-OST0000-osc-ffff927382fdc000/max_pages_per_rpc=8: Numerical result out of range error: set_param: setting 'osc/lustre-OST0000-osc-[-0-9a-f]*/max_pages_per_rpc'='8': Numerical result out of range osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=223 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=65 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=79 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=233 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=156 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=237 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=228 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=60 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=194 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=76 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=214 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=38 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=216 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=169 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=121 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=94 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=85 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=254 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=94 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=232 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=47 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=232 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=85 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=80 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=214 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=230 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=190 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=158 error: set_param: setting /sys/fs/lustre/osc/lustre-OST0000-osc-ffff927382fdc000/max_pages_per_rpc=12: Numerical result out of range error: set_param: setting 'osc/lustre-OST0000-osc-[-0-9a-f]*/max_pages_per_rpc'='12': Numerical result out of range osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=224 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=36 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=250 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=79 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=240 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=150 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=219 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=123 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=96 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=57 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=233 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=78 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=126 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=179 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=20 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=28 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=68 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=93 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=49 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=76 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=79 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=224 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=70 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=222 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=167 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=33 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=79 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=134 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=233 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=159 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=143 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=73 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=50 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=58 osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=155 204800+0 records in 204800+0 records out 838860800 bytes (839 MB, 800 MiB) copied, 866.053 s, 969 kB/s osc.lustre-OST0000-osc-ffff927382fdc000.max_pages_per_rpc=256