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Date: Thu, 5 Aug 2004 13:46:15 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: "Mr. Berkley Shands" <berkley@cse.wustl.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Severe I/O performance regression 2.6.6 to 2.6.7 or 2.6.8-rc3
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William Lee Irwin III wrote:
>> By any chance could you do binary search on the bk snapshots between
>> 2.6.6 and 2.6.7?

On Thu, Aug 05, 2004 at 02:58:50PM -0500, Mr. Berkley Shands wrote:
> the problem does not exist using 2.6.6-bk6, but exists on 2.6.6-bk7. 
> -bk8 and -bk9 faile to build.
> these are from patches-2.6.6-bk6 off snapshots/old and applied to a 
> vanilla 2.6.6 kernel.

This is the closest it appears to be possible to narrow down where the
regression happened.

Some form of changelogging to enumerate what the contents of the
2.6.6-bk6 -> 2.6.6-bk7 delta are and to reconstruct intermediate points
between 2.6.6-bk6 and 2.6.6-bk7 is needed.

I have already tried to carry out various procedures to accomplish this
for several other problem reports and/or issues and come have come away
from the effort highly discouraged (having made zero progress) each time.


-- wli