Re: RE: Linux client on Solaris 7 NFS server

[dwight@supercomputer.org]

Thanks for the suggestion, Ian. It was a good one, and I've carried it a
little farther.

First, this is all single threaded at the user level. It's a mixture of
reads and writes; akin to a large compile (actually link) of a bunch of
files, creating one big binary. Just using a local disk, we're looking at
about 3-4 secs. Over NFS, it's 30 seconds, except for the Linux client case.

Doing just reads (dd of the 2.4.23 kernel source .tgz, which is about 35 MB),
it takes about 3-4 seconds. That's UDP, with a dd blocksize to match the
NFS r/w size of 8k, on a 100 Mbs network. So this matches your results.
This is for a Linux client talking to either a Linux or a Solaris server.

However, doing a write, I see different results. In the Linux/Linux case,
again the result is again about 3-4 seconds. However, with a Linux-client/
Solaris-server, it takes about 12 seconds. This is a factor of 3-4.

I'm wondering if the mixture of reads and writes is what is driving the
degradation up to a factor of 6.

I'll give the pure Solaris/Solaris results a try. Anecdotally, I've heard
that there are also similar issues with HP-UX and AIX, though I haven't
tried it out myself.

Best Regards,

	-dwight-


Ian Kent wrote:

> I had some figures, but I've deleted them.
> 
> Basically I'm saying, with a 100Mb(it)/sec interface I get just over
> 8 MB(ytes)/sec whereas I can consistently get over 10MB(ytes)/sec on most
> Sparcs (Solaris). So the Sparcs are pushing their interfaces about fast as
> they can go but the Linux box is not. So there's still room for
> improvement.





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