From: Benjamin LaHaise <bcrl@kvack.org>
To: Willy Tarreau <w@1wt.eu>
Cc: David Miller <davem@davemloft.net>,
stable@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [stable 2.6.32.y PATCH 0/6] net: fixes for cached dsts are never invalidated
Date: Fri, 19 Oct 2012 16:22:44 -0400 [thread overview]
Message-ID: <20121019202244.GH8315@kvack.org> (raw)
In-Reply-To: <20121019201430.GI17417@1wt.eu>
On Fri, Oct 19, 2012 at 10:14:31PM +0200, Willy Tarreau wrote:
...
> So maybe in the end we should just merge d11a4dc18 that Ben found to be
> the least invasive one fixing the issues, and we'd be in sync with the
> rest of the stable branches, even if, as you noted a few days ago, it's
> only a partial fix for the issue.
>
> Ben, what's your opinion on this ? I know it's never fun to do backports
> and not merge them later, but I trust David more than anyone else on the
> network part, so if he decided that while incomplete, the patch above
> was all that was needed for other stable branches, maybe we should just
> stay on the safe side and do the same ?
There is a caveat to the minimally invasive fix: doing so will result in
cached routes always being lookup up when the check occurs. This could
potentially result in a performance regression from some users. The
tradeoffs here are really murky.
-ben
--
"Thought is the essence of where you are now."
next prev parent reply other threads:[~2012-10-19 20:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-19 19:13 [stable 2.6.32.y PATCH 0/6] net: fixes for cached dsts are never invalidated Benjamin LaHaise
2012-10-19 19:21 ` [PATCH 1/6] ipv4: check rt_genid in dst_check Benjamin LaHaise
2012-10-19 19:21 ` [PATCH 2/6] net: Document dst->obsolete better Benjamin LaHaise
2012-10-19 19:21 ` [PATCH 3/6] ipv6: use DST_* macro to set obselete field Benjamin LaHaise
2012-10-19 19:21 ` [PATCH 4/6] netns: move net->ipv4.rt_genid to net->rt_genid Benjamin LaHaise
2012-10-19 19:22 ` [PATCH 5/6] ipv6: use net->rt_genid to check dst validity Benjamin LaHaise
2012-10-19 19:22 ` [PATCH 6/6] xfrm: invalidate dst on policy insertion/deletion Benjamin LaHaise
2012-10-19 19:48 ` [stable 2.6.32.y PATCH 0/6] net: fixes for cached dsts are never invalidated Willy Tarreau
2012-10-19 19:49 ` David Miller
2012-10-19 19:55 ` Willy Tarreau
2012-10-19 20:01 ` David Miller
2012-10-19 20:03 ` Willy Tarreau
2012-10-19 20:07 ` David Miller
2012-10-19 20:14 ` Willy Tarreau
2012-10-19 20:22 ` Benjamin LaHaise [this message]
2012-10-19 20:53 ` Willy Tarreau
2012-10-19 21:03 ` Benjamin LaHaise
2012-10-19 21:22 ` Willy Tarreau
2012-10-19 20:18 ` Benjamin LaHaise
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