linux-kernel - 2.6.20 (+2.6.21-rc4) write hang modifier

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Message-ID: <4602BF9A.2080402@exegy.com>
Date:	Thu, 22 Mar 2007 12:40:42 -0500
From:	"Mr. Berkley Shands" <bshands@...gy.com>
To:	linux-xfs@....sgi.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Cc:	Dave Lloyd <dlloyd@...gy.com>
Subject: 2.6.20 (+2.6.21-rc4) write hang modifier

If I set /proc/sys/vm/dirty_ratio to "5" the write lockup happens within
the first MilliSecond, at about 100MB per file system.
If I slew the dirty_ratio to 80, the lockup happens
at about 2GB per file system.

2.6.21-rc4 has the same symptoms, and same lockups.
It appears that mptsas is dropping something.

berkley

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//E. F. Berkley Shands, MSc//

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