Date: Tue, 14 Jun 2011 17:56:43 +0300 From: Mikolaj Golub <trociny@freebsd.org> To: Daniel Kalchev <daniel@digsys.bg> Cc: pjd@freebsd.org, freebsd-stable@freebsd.org Subject: Re: HAST instability Message-ID: <86ei2wmpg4.fsf@in138.ua3> In-Reply-To: <4DF7647F.7020901@digsys.bg> (Daniel Kalchev's message of "Tue, 14 Jun 2011 16:39:11 %2B0300") References: <4DE21C64.8060107@digsys.bg> <4DE3ACF8.4070809@digsys.bg> <86d3j02fox.fsf@kopusha.home.net> <4DE4E43B.7030302@digsys.bg> <86zkm3t11g.fsf@in138.ua3> <4DE5048B.3080206@digsys.bg> <4DE5D535.20804@digsys.bg> <4DE8FE78.6070401@digsys.bg> <4DE90955.9020505@digsys.bg> <86zklp8vmg.fsf@kopusha.home.net> <86vcwd8vj8.fsf@kopusha.home.net> <4DF7647F.7020901@digsys.bg>
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On Tue, 14 Jun 2011 16:39:11 +0300 Daniel Kalchev wrote: DK> On 10.06.11 20:07, Mikolaj Golub wrote: >> On Fri, 10 Jun 2011 20:05:43 +0300 Mikolaj Golub wrote to Daniel Kalchev: >> >> MG> Could you please try this patch? >> >> MG> http://people.freebsd.org/~trociny/hastd.no_shutdown.patch >> >> Sure you still have to have your kernel patched with uipc_socket.c.patch :-) >> DK> It is now running for about a day with both patches applied, without DK> disconnects. DK> Also, now TCP/IP connections always stay in ESTABLISHED state. As I DK> believe they should. Primary to secondary drain quickly on switching DK> form init to primary etc. No troubles without checksums as DK> well. Kernel is as of Thanks! It has turned out that automatic receive buffer sizing works only for connections in ESTABLISHED state. And with small receive buffer the connection might stuck sending data only via TCP window probes -- one byte every few seconds (see "Scenario to make recv(MSG_WAITALL) stuck" in net@ for details). hastd.no_shutdown.patch disables closing of unused directions so the connections remain in ESTABLISHED state and automatic receive buffer sizing works again. uipc_socket.c.patch has been committed to CURRENT and I am going to MFC soon. DK> FreeBSD b1a 8.2-STABLE FreeBSD 8.2-STABLE #1: Mon Jun 13 11:32:38 EEST DK> 2011 root@b1a:/usr/obj/usr/src/sys/GENERIC amd64 DK> Daniel -- Mikolaj Golub
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