linux-kernel - Re: [PATCH] net: delete expired route in ip6_pmtu

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Date:	Thu, 16 Dec 2010 12:28:55 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	avagin@...nvz.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: delete expired route in ip6_pmtu_deliver

From: Andrey Vagin <avagin@...nvz.org>
Date: Sun, 12 Dec 2010 04:20:11 +0300

> The first big packets sent to a "low-MTU" client correctly
> triggers the creation of a temporary route containing the reduced MTU.
> 
> But after the temporary route has expired, new ICMP6 "packet too big"
> will be sent, rt6_pmtu_discovery will find the previous EXPIRED route
> check that its mtu isn't bigger then in icmp packet and do nothing
> before the temporary route will not deleted by gc.
> 
> I make the simple experiment:
> while :; do
>     time ( dd if=/dev/zero bs=10K count=1 | ssh hostname dd of=/dev/null ) || break;
> done
> 
> The "time" reports real 0m0.197s if a temporary route isn't expired, but
> it reports real 0m52.837s (!!!!) immediately after a temporare route has
> expired.
> 
> Signed-off-by: Andrey Vagin <avagin@...nvz.org>

Applied and queued up for -stable, thanks.
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