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* Quick fix for LSI8888ELP overruns in 2.6.20 and 2.6.21-rc4
@ 2007-03-22 19:08 Mr. Berkley Shands
  0 siblings, 0 replies; only message in thread
From: Mr. Berkley Shands @ 2007-03-22 19:08 UTC (permalink / raw)
  To: linux-xfs, linux-kernel, linux-scsi

My local kernel guru recognized this problem as a duplicate of the
LSI8408E bus lockup problem. The controller gets flooded with work,
and just climbs under a rock to hide. In the 8408E case, it
froze the PCI-e bus :-)

# set the max request queue down from 128. any more than 32
# quickly slows down from 810MB/Sec to 11MB/Sec.
setenv X 32
foreach i ( /sys/block/sd{g,h,i,j,k,l,m,n}/queue/nr_requests)
   echo $X > $i

Lots of time was spent in the congestion queue, like 99% of the time.

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2007-03-22 19:08 Quick fix for LSI8888ELP overruns in 2.6.20 and 2.6.21-rc4 Mr. Berkley Shands

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