Messages in this thread | | | Date | Wed, 26 May 1999 15:38:41 +0200 (CEST) | Subject | Bad NFS performance with client 2.2.9 | From | Trond Myklebust <> |
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>>>>> " " == Thierry Danis <danis@sagem.fr> writes:
> With 2.2.9 client, the load of the server climbs up to 3 during > reading (we have the same with many 2.2.6[-ac?] readers). It > used to have a much more reasonnable load with one 2.2.6 client > (around 0,5) during reading.
But what is it that is taking time? The fact that the server has a high load can mean 1 of 2 things: either the client is sending too many requests, or the server is being too slow in processing requests and replying. The fact that the reading is bad would tend to favour the latter.
A tcpdump should be able to determine which of the two is the problem.
BTW: against our own server with the linux-2.2.9 + the knfsd-1.3.2 + NFSv3 client patches, I'm now seeing the following results (never been better):
IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) By Bill Norcott
Operating System: POSIX 1003.1-1990
Send comments to: b_norcott@xway.com
IOZONE writes a 120 Megabyte sequential file consisting of 15360 records which are each 8192 bytes in length. It then reads the file. It prints the bytes-per-second rate at which the computer can read and write files.
Writing the 120 Megabyte file, 'zz'...13.900000 seconds Reading the file...14.120000 seconds
IOZONE performance measurements: 9052454 bytes/second for writing the file 8911410 bytes/second for reading the file
Cheers, Trond
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