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From: "Mr. Berkley Shands" <>
Subject: Quick fix for LSI8888ELP overruns in 2.6.20 and 2.6.21-rc4
Date: Thu, 22 Mar 2007 14:08:35 -0500	[thread overview]
Message-ID: <> (raw)

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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                 reply	other threads:[~2007-03-22 19:10 UTC|newest]

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