Date: Sun, 04 Nov 2012 17:39:10 -0800 From: Manfred Antar <null@pozo.com> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: weird network problems on current since 10/28/2012 Message-ID: <201211050139.qA51daHj019870@pozo.com> In-Reply-To: <5096E4D4.6000000@freebsd.org> References: <201211031740.qA3HeqVX001622@pozo.com> <CAJ-VmomAR8N8ovhC7La3ttG=7Qu_%2BVwD30tPxFBpzC37eg9CHA@mail.gmail.com> <201211040113.qA41DfLn001577@pozo.com> <50964FBB.4010600@andric.com> <d125c29193960f0932391c161dca233e.squirrel@webmail.kim.net> <50967453.5090503@freebsd.org> <5096CCDE.7090305@fgznet.ch> <5096E4D4.6000000@freebsd.org>
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At 01:57 PM 11/4/2012, you wrote:
>On 04.11.2012 21:15, Andreas Tobler wrote:
>>On 04.11.12 14:57, Andre Oppermann wrote:
>>>On 04.11.2012 13:11, Kim Culhan wrote:
>>>>On Sun, November 4, 2012 6:21 am, Dimitry Andric wrote:
>>>>>On 2012-11-04 02:13, Manfred Antar wrote:
>>>>>>At 03:29 PM 11/3/2012, Adrian Chadd wrote:
>>>>>After the commit, there was a small discussion thread on svn-src-head@
>>>>>about the possible problems with the approach. Maybe you are
>>>>>experiencing those?
>>>>>
>>>>>As the commit message says, you should be able to turn the feature off
>>>>>using:
>>>>>
>>>>> sysctl net.inet.tcp.experimental.initcwnd10=0
>>>>>
>>>>>Can you please try that, and see if the problems go away?
>>>>
>>>>FWIW this did not make the problem go away on 2 machines.
>>>
>>>Yes, this very much looks like the same problem as in PR/173309.
>>>
>>>Please try the attached patch. It fixes the connection hang issue.
>>>There may be a second issue I debugging currently base on the feedback
>>>from Fabian Keil.
>>
>>I jump into this thread since I have a similar network issue.
>>
>>My scenario:
>>
>>'make installkernel DESTDIR=/netboot/test' to a nfs mounted drive.
>>The nfs drive on the server is an ufs fs. No zfs.
>>
>>Up to r242261 I can install the kernel (or world) in a fluent way to the
>>nfs destination.
>>
>>>From r242262 it doesn't work smooth. I have stalls, sometimes my
>>patience is not enough and I kill the process.
>>
>>I tried 242266 with the above mentioned patch. No real success.
>>
>>How can I help/test?
>
>Please try the attach patch instead of the above mentioned one.
>
>--
>Andre
>
>Index: netinet/tcp_output.c
>===================================================================
>--- netinet/tcp_output.c (revision 242577)
>+++ netinet/tcp_output.c (working copy)
>@@ -228,7 +228,7 @@
> tso = 0;
> mtu = 0;
> off = tp->snd_nxt - tp->snd_una;
>- sendwin = min(tp->snd_wnd, tp->snd_cwnd);
>+ sendwin = ulmax(ulmin(tp->snd_wnd - off, tp->snd_cwnd), 0);
>
> flags = tcp_outflags[tp->t_state];
> /*
>@@ -249,7 +249,7 @@
> (p = tcp_sack_output(tp, &sack_bytes_rxmt))) {
> long cwin;
>
>- cwin = min(tp->snd_wnd, tp->snd_cwnd) - sack_bytes_rxmt;
>+ cwin = ulmin(tp->snd_wnd - off, tp->snd_cwnd) - sack_bytes_rxmt;
> if (cwin < 0)
> cwin = 0;
> /* Do not retransmit SACK segments beyond snd_recover */
>@@ -355,7 +355,7 @@
> * sending new data, having retransmitted all the
> * data possible in the scoreboard.
> */
>- len = ((long)ulmin(so->so_snd.sb_cc, tp->snd_wnd)
>+ len = ((long)ulmin(so->so_snd.sb_cc, tp->snd_wnd - off)
> - off);
> /*
> * Don't remove this (len > 0) check !
This doesn't seem to make a difference.
I have a ssh window thats been trying to connect for the past 5 minutes.
This is on a local network 192.168.0.4 >===========SSH==============> 192.168.0.5
Also pop from the same machines endless trying to connect.
Hopefully this mail will get thru , otherwise i will need to reboot to old kernel
Manfred
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