From owner-freebsd-hackers  Mon Jan 18 01:05:59 1999
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From: "John S. Dyson" <root@dyson.iquest.net>
Message-Id: <199901180905.EAA25734@dyson.iquest.net>
Subject: Re: Found problem w/ Paging performance over NFS
In-Reply-To: <199901180514.VAA57485@apollo.backplane.com> from Matthew Dillon at "Jan 17, 99 09:14:25 pm"
To: dillon@apollo.backplane.com (Matthew Dillon)
Date: Mon, 18 Jan 1999 04:05:32 -0500 (EST)
Cc: dg@root.com, jkh@FreeBSD.ORG, hackers@FreeBSD.ORG
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>     This is pretty cool - I figured out why the paging performance is so
>     horrible over NFS but good to local disk.
> 
>     It turns out that the NFS subsystem looks at B_ASYNC in the bp.  This
>     flag is not set by the paging code, so the NFS writes requested by the
>     pageout daemon were being done synchronously.
> 
...
>
>     I've also upgraded my LAN to 100BaseTX to test it.  With 4 nfsiod's 
>     running, I am getting excellent paging performance to NFS swap - 1.5 to 
>     2.5 megabytes a second on pageout instead of 250 KBytes/sec.  The diskless
>     workstation now pages out as well as a normal server!
> 
Intergalactic!!! :-).

John

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