claude pignol wrote:
Greetings,
Thanks for your previous answers on the compatibility 2.7.1/ 2.8.1
I have a strange problem:
Version 2.7.1
I/O server AMD Opteron 2350 kernel 2.6.18-164.el5
Client AMD Opteron 2350 kernel 2.6.18-164.el5
In this configuration cp a file from pvfs (using the kernel interface)
is running at 40MB/s
If the client is an Intel Xeon 5550 and the kernel 2.6.18-164.el5 the
cp is running at 9 MB/s
and it could go as low as 1.9MB/s with block size of 32KB (dd
if=testfile of=/dev/null bs=32K count=2000)
I did a test with an older kernel 2.6.18-128.el5 on the Intel Xeon 5550
an I get a transfer speed of 40MB/s even with 32K block.
So something has changed in the 164 version. I tested also the version
2.6.18-164.6.1 and get the same low speed.
Is this a known problem?
Claude
Hi Claude,
What kind of network card does the machine have? Have you tried any
network benchmarks (netpipe or similar) to see if there is network
performance is different in general between the two versions?
-Phil
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