Hi all,
recently we've found serious performance degradation for TCP connections
between FreeBSD 4.9 and 4.11 at larger packet sizes.
We're using two identical machines with Intel PRO/1000 82547EI chipset,
which were able to run wirespeed at all packet sizes when 4.9 was installed
on both of them. The tests are performed using nttcp -T -n500000
Here are the results:
TCP payload 4.9->4.11 4.11->4.9
----------------------------------------------------
1448 Bytes 941.0007 Mbps 941.1021 Mbps
2048 957.5791 957.5312
4096 978.1912 978.2145
6144 715.3935 715.7244
8192 631.8491 988.7455
It is obvious, that transfers with TCP payloads upto 4 kB are wirespeed,
while larger packets have significantly degraded performance.
Any ideas?
Thanks & kind regards,
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---- Marian Durkovic network manager ----
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---- Slovak Technical University Tel: +421 2 524 51 301 ----
---- Computer Centre, Nam. Slobody 17 Fax: +421 2 524 94 351 ----
---- 812 43 Bratislava, Slovak Republic E-mail/sip: [EMAIL PROTECTED]
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