Date: Mon, 23 Apr 2007 04:06:10 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: "Marc G. Fournier" <scrappy@freebsd.org> Cc: Chris <chrcoluk@gmail.com>, "Brian A. Seklecki" <bseklecki@collaborativefusion.com>, Thiago Esteves de Oliveira <thiago@lamce.coppe.ufrj.br>, freebsd-stable@freebsd.org, freebsd-questions@freebsd.org Subject: Re: No buffer space available Message-ID: <20070423110610.GA13461@icarus.home.lan> In-Reply-To: <C026F1B57DCE5BEBC3092764@ganymede.hub.org> References: <AEA472FF17EA8BD1BD5003C2@ganymede.hub.org> <3aaaa3a0704052217g67281716ge8a2d1a888025d0e@mail.gmail.com> <0D3D8201F40120DCE73AD00B@ganymede.hub.org> <3aaaa3a0704071212o3b4dce4dgd8def804e5b1156c@mail.gmail.com> <C026F1B57DCE5BEBC3092764@ganymede.hub.org>
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On Sat, Apr 07, 2007 at 08:20:58PM -0300, Marc G. Fournier wrote: > - --On Saturday, April 07, 2007 20:12:00 +0100 Chris <chrcoluk@gmail.com> wrote: > > Also to add I now have a 2nd box using 6.2 STABLE few days old code, > > had to use it because of broadcom 5755 nic card, I plan to use large > > tcp window sizes so will be interesting to see if this also suffers > > from the problem. > > I've got 8 servers on the same network, 3 are almost identical, but one of them > (the one with the problem) is using software RAID vs hardware ... but, if you > are seeing it without using software RAID, then that is obviously not the > culprit :( May be a red herring... I'm able to reproduce the "No buffer space available" message when setting net.inet.tcp.(send|recv)space to non-default values. All I've tried is the following, with a kernel dated 2007/04/22: # sysctl net.inet.tcp.sendspace=131072 # sysctl net.inet.tcp.recvspace=262144 Example session: $ su2 # sysctl net.inet.tcp.sendspace=131072 net.inet.tcp.sendspace: 32768 -> 131072 # sysctl net.inet.tcp.recvspace=262144 net.inet.tcp.recvspace: 65536 -> 262144 # logout $ ssh medusa socket: No buffer space available ssh: connect to host medusa port 22: No buffer space available $ su2 # sysctl net.inet.tcp.sendspace=32768 net.inet.tcp.sendspace: 131072 -> 32768 # sysctl net.inet.tcp.recvspace=65536 net.inet.tcp.recvspace: 262144 -> 65536 # logout $ ssh medusa Last login: Mon Apr 23 03:45:45 2007 from ... I assume this is because the maximum size of a TCP datagram is 65536 bytes, but as I'm not familiar enough with TCP on such a low level, this may be speculation on my part. Just something worth checking/tinkering with. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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