Date: Thu, 5 May 2005 15:32:50 +0200 From: Marian Durkovic <md@bts.sk> To: freebsd-net@freebsd.org Subject: Degraded TCP performace between 4.9 and 4.11 Message-ID: <20050505133250.GA73885@us.svf.stuba.sk>
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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, -------------------------------------------------------------------------- ---- ---- ---- Marian Durkovic network manager ---- ---- ---- ---- 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: md@bts.sk ---- ---- ---- --------------------------------------------------------------------------
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