Bad performance while transfer large block size through NFS.

[Arne Wörner]

> I set up one NFS server, and mounted on other server by TCP. Servers
> connected with Giga network, and running 6.2-RELEASE.
>
> But I found the performance is very bad while transfering large block
> size data.
>
I dont know if it makes any sense, but at least the following experiment might
be fun:

1. With various block sizes (e. g. 32k, 128k, 1m, 2m) on the client box:
dd if=/dev/zero of=/dev/null bs=XXX count=1k

2. With various block sizes (e. g. 32k, 128k, 1m, 2m) on the client box:
dd if=/dev/zero bs=XXX count=1k | dd of=/path/to/nfs/mount bs=32k

3. With various block sizes (e. g. 32k, 128k, 1m, 2m) on the client box:
dd if=/dev/zero bs=XXX count=1k | dd of=/dev/null bs=32k

The idea would be, that possibly the client box has problems, when it has to
handle big data blocks inside the kernel (in that case part 1 would show the
same performance degradation as ur initial test).

-Arne



 
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