On Sat, 13 Jan 2007, Al Boldi wrote:

Justin Piszcz wrote:

quoted

On Sat, 13 Jan 2007, Al Boldi wrote:

quoted

Justin Piszcz wrote:

quoted

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.

Can you repeat with /dev/sda only?

For sda-- (is a 74GB raptor only)-- but ok.

Do you get the same results for the 150GB-raptor on sd{e,g,i,k}?

quoted

# 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?

Probably a latency issue.  md is highly latency sensitive.

What CPU type/speed do you have?  Bootlog/dmesg?


Thanks!

--
Al

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What CPU type/speed do you have?  Bootlog/dmesg?

Core Duo E6300

The speed is great since I have tweaked the various settings..