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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
