Date: Sat, 21 Aug 1999 09:49:39 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "John S. Dyson" <dyson@iquest.net> Cc: bright@rush.net (Alfred Perlstein), eivind@FreeBSD.ORG (Eivind Eklund), peter@FreeBSD.ORG (Peter Wemm), current@FreeBSD.ORG Subject: Re: NFS HEADS UP (was Re: cvs commit: src/sys/nfs nfsm_subs.h xdr_subs.h) Message-ID: <199908211649.JAA73759@apollo.backplane.com> References: <199908211156.GAA20231@dyson.iquest.net.>
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:> Well, the issue with converting many of the macros to inline functions
:> is with the embedded goto's and references to variables defined outside
:> the macros. Converting them to functions would basically require
:> rewriting a huge chunk of NFS code.
:>
:My working kernel runs with a few strategic NFS macros being converted
:to functions, and the size improvement is about 50K or so (maybe more!!!)
:
:John
If you want to port some of it in that part of the source tree will be
available in a month or two, depending on how quickly the other stuff in
my queue gets committed. I've got two patch sets currently under test
related to other NFS issues and a third one in the wings.
Hey, speaking of NFS ... I'm working on optimizing the commit rpc and
I noticed something interesting. The commit rpc includes an offset and
a length field.
Does anyone know why our NFS clients are sending a separate RPC for each
8K buffer? If the dirty space is contiguous across a number of buffers
we should be able to send a *SINGLE* commit rpc to the server. That would
greatly reduce system overhead on both the client and server when writing
a large file over NFS. This would seem to be an almost free optimization
that would mesh extremely well with the nfsrv_commit optimizations I'm
making right now.
At the moment I can saturate a 100BaseTX with NFS writes and get
10 MBytes/sec to the platter on the server, but the cpu required on both
the client and server to do that is well over 60% of a Pentium III-450.
-Matt
Matthew Dillon
<dillon@backplane.com>
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