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>
next in thread | previous in thread | raw e-mail | index | archive | help
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 ======================== || null@pozo.com || || Ph. (415) 681-6235 || ======================== -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201211050139.qA51daHj019870>