Date: Tue, 1 Feb 2011 16:15:01 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Stefan Lambrev <stefan.lambrev@moneybookers.com> Cc: freebsd-performance@freebsd.org, Julian Elischer <julian@freebsd.org>, Bruce Evans <brde@optusnet.com.au> Subject: Re: Interrupt performance Message-ID: <20110201131501.GV18170@zxy.spb.ru> In-Reply-To: <CAE4CCBC-F934-45E7-AAE6-BD914C3F5577@moneybookers.com> References: <22E77EED-6455-4164-9115-BBD359EC8CA6@moneybookers.com> <20110128161035.GF18170@zxy.spb.ru> <CDBFAB7F-1EBC-4B3A-B2F5-6162DD58A93D@moneybookers.com> <4D42F87C.7020909@freebsd.org> <20110128172516.GG18170@zxy.spb.ru> <20110129070205.Q7034@besplex.bde.org> <20110201113724.GS18170@zxy.spb.ru> <8979148D-8F2E-49E3-86EE-41CE6F57CDA4@moneybookers.com> <20110201121803.GT18170@zxy.spb.ru> <CAE4CCBC-F934-45E7-AAE6-BD914C3F5577@moneybookers.com>
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On Tue, Feb 01, 2011 at 02:23:32PM +0200, Stefan Lambrev wrote: > >> Also in the past ENOBUF was not handled properly in linux. > >> > >> http://wiki.freebsd.org/AvoidingLinuxisms - Do not rely on Linux-specific socket behaviour. In particular, default socket buffer sizes are different (call setsockopt() with SO_SNDBUF and SO_RCVBUF), and while Linux's send() blocks when the socket buffer is full, FreeBSD's will fail and set ENOBUFS in errno. > > > > Yes, about ENOBUFS with udp socket I told. > > And this behaviour (block on udp socket send) in Solaris too. > > I don't know what behaviour is right. > > Well, according to the man pages in linux and fbsd the bsd behavior is right. I was looking into this long time ago with some red hat linux. I have't any idea for blocking UDP socket, other then benchmarks. Now I test TCP and see strange result. # netperf -H 10.200.0.1 -t TCP_STREAM -C -c -l 60 -- -s 128K -S 128K TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.200.0.1 (10.200.0.1) port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % U % U us/KB us/KB 131072 131072 131072 60.00 522.08 -1.00 -1.00 0.000 -0.314 Now I run ./loop 2000000000 and see stoping transmit. procs memory page disk faults cpu r b w avm fre flt re pi po fr sr ad0 in sy cs us sy id 2 0 0 107M 435M 0 0 0 0 0 0 0 15939 618 39502 0 77 23 1 0 0 107M 435M 0 0 0 0 0 0 0 15904 619 39355 0 75 25 1 0 0 107M 435M 0 0 0 0 0 0 0 16193 615 40085 0 79 21 1 0 0 107M 435M 0 0 0 0 0 0 0 16028 623 39708 1 74 26 1 0 0 107M 435M 0 0 0 0 0 0 0 15965 615 39475 0 77 23 1 0 0 107M 435M 0 0 0 0 0 0 0 16012 636 39666 0 84 16 <-- run ./loop 2000000000 2 0 0 109M 435M 46 0 0 0 9 0 0 9632 507 24041 48 51 1 2 0 0 109M 435M 0 0 0 0 0 0 0 6592 319 16419 73 27 0 2 0 0 109M 435M 0 0 0 0 0 0 0 455 136 1250 100 0 0 2 0 0 109M 435M 0 0 0 0 0 0 0 420 127 1170 99 1 0 2 0 0 109M 435M 0 0 0 0 0 0 0 395 127 1127 100 0 0 2 0 0 109M 435M 0 0 0 0 0 0 0 428 127 1209 100 0 0 2 0 0 109M 435M 0 0 0 0 0 0 0 537 130 1434 99 1 0 2 0 0 109M 435M 0 0 0 0 0 0 0 449 136 1255 100 0 0 1 0 0 107M 435M 14 0 0 0 37 0 0 7634 400 19044 56 30 14 <- end ./loop (Elapsed 8470990 us) 1 0 0 107M 435M 0 0 0 0 0 0 0 14893 579 37088 0 75 25 1 0 0 107M 435M 0 0 0 0 0 0 0 16123 615 40163 0 78 22 1 0 0 107M 435M 0 0 0 0 0 0 0 15220 582 37939 0 72 28 Wtf?
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