linux-kernel - Re: Linux 2.6.32.61

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Message-ID: <20130614055406.GA880@1wt.eu>
Date:	Fri, 14 Jun 2013 07:54:06 +0200
From:	Willy Tarreau <w@....eu>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Linux 2.6.32.61

Hi Ben,

On Fri, Jun 14, 2013 at 05:11:55AM +0100, Ben Hutchings wrote:
> On Mon, 2013-06-10 at 12:15 +0200, Willy Tarreau wrote:
> [...]
> > Eric Dumazet (8):
> [...]
> >       softirq: reduce latencies
> [...]
> 
> This one apparently introduces a regression, fixed in mainline by commit
> 34376a50fb1f 'Fix lockup related to stop_machine being stuck in
> __do_softirq.'
> 
> I'm a bit surprised that you picked it for 2.6.32 as it wasn't applied
> to any other branch older than 3.9.

Interesting. It was discussed on stable@ in March between Eric and Paul
about the pertinence of merging it into 2.6.32 and 2.6.34 (both CCed).
The thread was '[PATCH] net: reduce net_rx_action() latency to 2 HZ'.
It is supposed to fix a but introduced in 2.6.29 by commit 24f8b2385
(net: increase receive packet quantum).

I didn't notice that it was not in more recent versions.

Eric, do you suggest that I revert this patch or that I also include the
mainline fix above to fix the regression ? If the latter, should Paul and
Greg also take the two patches ?

Thanks,
Willy

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