Linux-kernel mailing list archive 1999-23,: Still slow NFS reading versus 2.2.9

# Still slow NFS reading versus 2.2.9

Thierry Danis (danis@sagem.fr)
Tue, 8 Jun 1999 20:26:00 +0200

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Hello,

I have reported some trouble having concurrent 2.2.9 NFS client
against a 2.2.9 knfsd 1.3 server.

I just tested with 2.2.9-ac4 and iozone. One iozone is correct
(not amazing, but just correct) :

IOZONE performance measurements:
6260155 bytes/second for writing the file
4870301 bytes/second for reading the file

However, 2 iozones (from the same client for example) show bad
behavior during rereading :

IOZONE performance measurements:
3203715 bytes/second for writing the file
604157 bytes/second for reading the file

Here : 3203715 * 2 ~= 6260155 (a little better), but :
604157 * 2 < 4870301 (which is really bad).

During the reading, the load of the server (which is doing nothing
else than serving the 2 NFS clients) climbs up to 5 (or more), and
is almost unresponsive.

With FreeBSD clients, the behavior is linear during reading, and
the load of the server does not jump to sky.

If I can provide more information, tell me what to do.

A+,

    --
    	Thierry Danis
    	Poste : 53 53	danis@spmo.sagem.fr

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