Messages in this thread |  | | Date | Mon, 30 Oct 2000 07:47:00 +0100 | From | Andi Kleen <> | Subject | Re: 2.2.18Pre Lan Performance Rocks! |
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On Sun, Oct 29, 2000 at 06:35:31PM -0700, Jeff V. Merkey wrote: > On Mon, Oct 30, 2000 at 12:04:23AM +0000, Alan Cox wrote: > > > It's still got some problems with NFS (I am seeing a few RPC timeout > > > errors) so I am backreving to 2.2.17 for the Ute-NWFS release next week, > > > but it's most impressive. > > > > Can you send a summary of the NFS reports to nfs-devel@linux.kernel.org > > Yes. I just went home, so I am emailing from my house. I'll post late > tonight or in the morning. Performance on 100Mbit with NFS going > Linux->Linux is getting better throughput than IPX NetWare Client -> > NetWare 5.x on the same network by @ 3%. When you start loading up a > Linux server, it drops off sharply and NetWare keeps scaling, however, > this does indicate that the LAN code paths are equivalent relative to > latency vs. MSM/TSM/HSM in NetWare. NetWare does better caching > (but we'll fix this in Linux next). I think the ring transitions to > user space daemons are what are causing the scaling problems > Linux vs. NetWare.
There are no user space daemons involved in the knfsd fast path, only in slow paths like mounting. The main problem I think in knfsd are the numerous copies of the data (e.g. 2+checksumming for RX with fragments, upto 4 in some specific configurations). They're unfortunately not trivial to fix. TX is a bit better, it does only one copy usually out of the page cache. For RX it also helps to have a network card that supports hardware checksumming.
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