Date: Thu, 29 Nov 2001 20:42:25 -0500 From: Leo Bicknell <bicknell@ufp.org> To: Pierre Beyssac <pb@fasterix.freenix.org> Cc: Josh Paetzel <friar_josh@webwarrior.net>, jc@irbs.com, freebsd-hackers@FreeBSD.ORG Subject: Re: FreeBSD performing worse than Linux? Message-ID: <20011129204225.A63957@ussenterprise.ufp.org> In-Reply-To: <20011130022547.A21889@fasterix.frmug.org>; from pb@fasterix.freenix.org on Fri, Nov 30, 2001 at 02:25:47AM %2B0100 References: <20011128153817.T61580@monorchid.lemis.com> <15364.38174.938500.946169@caddis.yogotech.com> <20011129004234.A16101@exuma.irbs.com> <20011130010354.A21307@fasterix.frmug.org> <20011129184414.F522@twincat.vladsempire.net> <20011130022547.A21889@fasterix.frmug.org>
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On Fri, Nov 30, 2001 at 02:25:47AM +0100, Pierre Beyssac wrote:
> What is the value of net.inet.tcp.sendspace on the server? It's 16K
> on -stable, it should be very interesting to try and increase it
> to 32K or 64K, it makes a lot difference on high bw*delay links.
*grumble* I'll try to avoid my tirade. 16K _will cause problems for
virtually all users_. You can do the math and see it won't keep a T1
full across country.
Now that I understand the issues with increasing it I see why we can't
go to real values (eg 256k) because FreeBSD's buffer management isn't
up to the task.
This default _really_ needs to be moved to 32k, with an increase in
default MBUF's. Machines have enough RAM, and it will allow people
to fill their home DSL connections. It also puts FreeBSD on par with
other OS's. I also think we need to support some of the work on
buffer management schemes to be able to do something even better.
--
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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