On Sat, 13 Jan 2007, Al Boldi wrote:
> Justin Piszcz wrote:
> > Btw, max sectors did improve my performance a little bit but
> > stripe_cache+read_ahead were the main optimizations that made everything
> > go faster by about ~1.5x. I have individual bonnie++ benchmarks of
> > [only] the max_sector_kb tests as well, it improved the times from
> > 8min/bonnie run -> 7min 11 seconds or so, see below and then after that is
> > what you requested.
> >
> > # echo 3 > /proc/sys/vm/drop_caches
> > # dd if=/dev/md3 of=/dev/null bs=1M count=10240
> > 10240+0 records in
> > 10240+0 records out
> > 10737418240 bytes (11 GB) copied, 399.352 seconds, 26.9 MB/s
> > # for i in sde sdg sdi sdk; do echo 192 >
> > /sys/block/"$i"/queue/max_sectors_kb; echo "Set
> > /sys/block/"$i"/queue/max_sectors_kb to 192kb"; done
> > Set /sys/block/sde/queue/max_sectors_kb to 192kb
> > Set /sys/block/sdg/queue/max_sectors_kb to 192kb
> > Set /sys/block/sdi/queue/max_sectors_kb to 192kb
> > Set /sys/block/sdk/queue/max_sectors_kb to 192kb
> > # echo 3 > /proc/sys/vm/drop_caches
> > # dd if=/dev/md3 of=/dev/null bs=1M count=10240
> > 10240+0 records in
> > 10240+0 records out
> > 10737418240 bytes (11 GB) copied, 398.069 seconds, 27.0 MB/s
> >
> > Awful performance with your numbers/drop_caches settings.. !
>
> Can you repeat with /dev/sda only?
>
> With fresh reboot to shell, then:
> $ cat /sys/block/sda/queue/max_sectors_kb
> $ echo 3 > /proc/sys/vm/drop_caches
> $ dd if=/dev/sda of=/dev/null bs=1M count=10240
>
> $ echo 192 > /sys/block/sda/queue/max_sectors_kb
> $ echo 3 > /proc/sys/vm/drop_caches
> $ dd if=/dev/sda of=/dev/null bs=1M count=10240
>
> $ echo 128 > /sys/block/sda/queue/max_sectors_kb
> $ echo 3 > /proc/sys/vm/drop_caches
> $ dd if=/dev/sda of=/dev/null bs=1M count=10240
>
> > What were your tests designed to show?
>
> A problem with the block-io.
>
>
> Thanks!
>
> --
> Al
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
Here you go:
For sda-- (is a 74GB raptor only)-- but ok.
# uptime
16:25:38 up 1 min, 3 users, load average: 0.23, 0.14, 0.05
# cat /sys/block/sda/queue/max_sectors_kb
512
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/sda of=/dev/null bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 150.891 seconds, 71.2 MB/s
#
#
#
# echo 192 > /sys/block/sda/queue/max_sectors_kb
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/sda of=/dev/null bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 150.192 seconds, 71.5 MB/s
# echo 128 > /sys/block/sda/queue/max_sectors_kb
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/sda of=/dev/null bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 150.15 seconds, 71.5 MB/s
Does this show anything useful?
Justin.
-
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]
