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Date:      Mon, 08 Oct 2001 09:06:10 -0500
From:      Eric Anderson <anderson@centtech.com>
To:        Danny Braniss <danny@cs.huji.ac.il>
Cc:        freebsd-hackers@freebsd.org, stable@freebsd.org
Subject:   Re: strange network performace
Message-ID:  <3BC1B2D2.E42F3704@centtech.com>
References:  <E15qawr-0000An-00@pampa.cs.huji.ac.il>

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Oh, well, I thought you said "10mb/s", not "10MB/s" .. that makes it a bit different.  I wonder if it could still be a
tcp window size or something.. Try these sysctl's on C:
vfs.nfs.gatherdelay=0
vfs.nfs.async=1
vfs.vmiodirenable=1
kern.ipc.maxsockbuf=2097152
kern.ipc.somaxconn=8192
kern.ipc.maxsockets=16424
kern.maxfiles=65536
kern.maxfilesperproc=32768
net.inet.tcp.rfc1323=1
net.inet.tcp.delayed_ack=0
net.inet.tcp.sendspace=65535
net.inet.tcp.recvspace=65535
net.inet.udp.recvspace=65535
net.inet.udp.maxdgram=57344
net.local.stream.recvspace=65535
net.local.stream.sendspace=65535


Just a try..


Danny Braniss wrote:
> 
> > And what happens when you go from A or B to C? Have you been running a top or systat -vmstat while this is happening?
> > I'm thinking it might be a purely IO thing, on the proc box.  I have seen similar slowness with the default FreeBSD
> > install on single proc boxes, but a few sysctl's seem to do the trick.
> 
> a reminder:
>         A -> NetAPP
>         B -> NetAPP
>         C -> NetAPP
> is fine, im running the same test, and the results are consitant, ~10MGBs
> 
> so that should eliminate network/switch/port/cable problems, right?
> 
> btw, no network errors are reported, neither from the hosts nor the switches.
> 
> danny
> 
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-- 
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Eric Anderson	 anderson@centtech.com    Centaur Technology
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