Re: IIS times out on large post requests

From: Krzysztof Oledzki <>
Date: Thu, 24 Jul 2008 21:51:59 +0200 (CEST)


On Thu, 24 Jul 2008, Willy Tarreau wrote:
> Hi Rainer,

> Oh you're making me think about something nasty. All 2.6.24 and 2.6.25
> kernels had a problem with FRTO which caused some TCP connections to
> be stuck after a few retransmits. This has been fixed in recent 2.6.25.X
> (don't precisely remember which one, but are OK and .4 is
> not). And it seems like some distro's 2.6.24 are not fixed. I don't
> know if the problem pre-dates 2.6.24, but at least 2.6.22 was OK.
> So if you're on 2.6.2[45], please upgrade to (or even .12 in
> a few days). Otherwise, maybe tcpdump will be best in order to catch
> the real problem.

Or simply try to disable FRTO with "sysctl net.ipv4.tcp_frto=0". It is interesting to know if this *workaround* helps.

BTW: is already available:

Best regards,

                                 Krzysztof Olędzki Received on 2008/07/24 21:51

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