Carlo Wood wrote: > Just one kernel version? The problem here is in every > kernel revision after 551c012d7eea3dc5ec063c7ff9c718d39e77634f > > 2.6.20-rc2,rc3,rc4,rc5,rc6,rc7 ... 2.6.20 ... 2.6.21 ... 2.6.22-rc5 > > noop: > Timing buffered disk reads: 254 MB in 3.00 seconds = 84.66 MB/sec > > anticipatory: > Timing buffered disk reads: 252 MB in 3.02 seconds = 83.43 MB/sec > > deadline: > Timing buffered disk reads: 258 MB in 3.02 seconds = 85.41 MB/sec > > cfq: > Timing buffered disk reads: 194 MB in 3.03 seconds = 64.06 MB/sec > > The normal value is cfq. So, all other schedulars are somewhat faster, > but still far from the correct 165 MB/s.
You may want to play with /sys/block/*/queue/max_sectors_kb and read_ahead_kb. On my system, setting them to 192 gives best performance, but cfq is always slower. Thanks! -- Al - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
