Messages in this thread | | | Date | Sun, 16 Mar 2008 17:24:38 +0100 | From | Gabriel Barazer <> | Subject | Re: [2.6.24.3][net] bug: TCP 3rd handshake abnormal timeouts |
| |
Hi
On 03/15/2008 9:55:27 AM +0100, Willy Tarreau <w@1wt.eu> wrote: > On Sat, Mar 15, 2008 at 09:47:24AM +0100, Gabriel Barazer wrote: > > Feel free to repost the whole issue overthere (along with your new tests) > if you don't get useful replies in a few days. > >> By the way thanks for replying. It's hard to explain and describe a >> problem when you know people will ask you hundreds of questions related >> to application-level problems, or not reply because web/mysql problems >> are so common and generally not related to any kernel issue. > > What caught my attention was the usual "3s delay", which is purely TCP > and application-independant. > > >>> Also, you say you have netfilter with conntrack. Is this on the client ? >>> If so, you should try disabling it to rule out any possible bug in the >>> connection tracking. >> I have the conntrack on both the client and server, and unfortunately >> can't disable it now on the client (I use it only for the REDIRECT >> target on a precise destination address and port, not MySQL related), >> however I will test today and disable it on the server, after I get some >> sleep (although I think the issue is on the client). > > I'm sure it's a client issue too, that's why it would be reasonable to > be able to try without conntrack. Can't you use a TCP proxy instead of > REDIRECT ? Also, you said that you also noticed the same behaviour in > other environments, maybe there you can disable conntrack ?
I was able to reproduce the bug multiple times without conntrack nor netfilter on the client and the server(I recompiled the kernel disabling the entire netfilter subsystem). The 3-second problem still occurs so we can completely rule out contrack-related bugs.
What can we do and test next?
Gabriel
| |