Date: Thu, 31 Mar 2005 09:39:21 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>,
       Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: NFS client latencies
Message-ID: <20050331073921.GA17455@elte.hu>
References: <1112137487.5386.33.camel@mindpipe> <1112138283.11346.2.camel@lade.trondhjem.org> <1112192778.17365.2.camel@mindpipe> <1112194256.10634.35.camel@lade.trondhjem.org> <20050330115640.0bc38d01.akpm@osdl.org> <1112217299.10771.3.camel@lade.trondhjem.org> <1112236017.26732.4.camel@mindpipe>
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* Lee Revell <rlrevell@joe-job.com> wrote:

> > Yes. Together with the radix tree-based sorting of dirty requests,
> > that's pretty much what I've spent most of today doing. Lee, could you
> > see how the attached combined patch changes your latency numbers?
> 
> Different code path, and the latency is worse.  See the attached ~7ms 
> trace.

could you check the -41-23 -RT kernel at the usual place:

   http://redhat.com/~mingo/realtime-preempt/

i've added Trond's radix lookup code, plus the lockbreaker patch.

(one thing that is not covered yet is nfs_scan_list() - that still scans 
a list. Trond, is that fixable too?)

	Ingo
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