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* 2.6.20: stripe_cache_size goes boom with 32mb
@ 2007-02-23 11:41 Justin Piszcz
  2007-02-23 12:41 ` Jason Rainforest
  2007-02-23 13:11 ` Jan Engelhardt
  0 siblings, 2 replies; 5+ messages in thread
From: Justin Piszcz @ 2007-02-23 11:41 UTC (permalink / raw)
  To: linux-kernel; +Cc: linux-raid

Each of these are averaged over three runs with 6 SATA disks in a SW RAID 
5 configuration:

(dd if=/dev/zero of=file_1 bs=1M count=2000)

128k_stripe: 69.2MB/s
256k_stripe: 105.3MB/s
512k_stripe: 142.0MB/s
1024k_stripe: 144.6MB/s
2048k_stripe: 208.3MB/s
4096k_stripe: 223.6MB/s
8192k_stripe: 226.0MB/s
16384k_stripe: 215.0MB/s

When I tried a 32768k stripe, this happened:
p34:~# echo 32768 > /sys/block/md4/md/stripe_cache_size
Connection to p34 closed

I was able to Alt-SysRQ+b but I could not access the console/X/etc, it 
appeared to be frozen.

FYI.

Justin.


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2007-02-23 19:11 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-02-23 11:41 2.6.20: stripe_cache_size goes boom with 32mb Justin Piszcz
2007-02-23 12:41 ` Jason Rainforest
2007-02-23 12:42   ` Justin Piszcz
2007-02-23 19:11     ` Dan Williams
2007-02-23 13:11 ` Jan Engelhardt

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