Date: Sat, 19 Mar 2011 16:04:00 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: George Neville-Neil <gnn@neville-neil.com> Cc: arch@freebsd.org Subject: Re: Updating our TCP and socket sysctl values... Message-ID: <20110319160400.000043f5@unknown> In-Reply-To: <132388F1-44D9-45C9-AE05-1799A7A2DCD9@neville-neil.com> References: <132388F1-44D9-45C9-AE05-1799A7A2DCD9@neville-neil.com>
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On Sat, 19 Mar 2011 15:37:47 +0900 George Neville-Neil <gnn@neville-neil.com> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Howdy, > > I believe it's time for us to upgrade our sysctl values for TCP > sockets so that they are more in line with the modern world. At the > moment we have these limits on our buffering: > > kern.ipc.maxsockbuf: 262144 > net.inet.tcp.recvbuf_max: 262144 > net.inet.tcp.sendbuf_max: 262144 > > I believe it's time to up these values to something that's in line > with higher speed local networks, such as 10G. Perhaps it's time to > move these to 2MB instead of 256K. > > Thoughts? I suggest to read http://www.bufferbloat.net/projects/bloat/wiki/Bufferbloat and do a before/after test to make sure we do not suffer from the described problem. Jim Getty has test descriptions: http://gettys.wordpress.com/category/bufferbloat/ Bye, Alexander.
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