linux-kernel - Re: New thread RDSL, post-2.6.20 kernels and amanda (tar) miss-fires

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Message-ID: <20070314054458.GQ2986@holomorphy.com>
Date:	Tue, 13 Mar 2007 22:44:58 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New thread RDSL, post-2.6.20 kernels and amanda (tar) miss-fires

On Tue, Mar 13, 2007 at 11:31:53PM -0400, Gene Heskett wrote:
>> Now, can someone suggest a patch I can revert that might fix this?  The 
>> total number of patches between 2.6.20 and 2.6.21-rc1 will have me 
>> building kernels to bisect this till the middle of June at this rate.

On Tue, Mar 13, 2007 at 10:07:21PM -0700, William Lee Irwin III wrote:
> 4 billion patches could be bisected in 34 boots. Between 2.6.20 and
> 2.6.21-rc1 there are only:
> $ git rev-list --no-merges v2.6.20..v2.6.21-rc1  |wc -l
> 3118
> patches, requiring 14 boots. In general ceil(log(n)/log(2))+2 boots.
> Of course, this is a little optimistic because it assumes no additional
> breakage occurring at the various bisection points. In any event,
> assuming (pessimistically) 10 minutes per build, this is 280 minutes or
> 4 hours and 40 minutes of build time. I estimate the process should
> complete well before Friday of this week, never mind June.

33 boots for 4 billion, 13 boots for 3118, ceil(log(n)/log(2))+1 boots
in general, 10 minutes/build gives 130 minutes or 2 hours, 10 minutes
for 13 boots. I have no plausible explanation for these errors, and
don't care to be told of any, either.


-- wli
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