Messages in this thread | | | Date | Mon, 25 Mar 2002 20:30:41 +0100 (CET) | From | Steffen Persvold <> | Subject | Network performance i 2.4.18 compared to 2.4.17 |
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Hi folks,
I've developed a network driver ontop of SCI. Now I've detected something wierd. Network performance, both UDP and TCP, measured with netperf is a little lower i 2.4.18 than in 2.4.17. The machines I'm running my tests on is Dual Athlon MP 1900 (1.6 GHz) in a Tyan Tiger MPX (S2566) board. Kernel configs on both 2.4.17 and 2.4.18 is excactly the same and its configured with cpu type K7.
Here are the numbers :
2.4.18 kernel :
TCP STREAM TEST to sci5 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. MBytes/sec
524288 524288 524288 9.99 175.87
UDP UNIDIRECTIONAL SEND TEST to sci5 Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # MBytes/sec
262144 32768 9.99 63054 0 197.22 262144 9.99 63054 197.22
and on 2.4.17 kernel :
TCP STREAM TEST to sci5 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. MBytes/sec
524288 524288 524288 10.00 182.92
UDP UNIDIRECTIONAL SEND TEST to sci5 Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # MBytes/sec
262144 32768 10.00 64359 0 201.20 262144 10.00 64359 201.20
Roughly 2% lower performance on UDP and 4% on TCP. Any explaination for this ?
Thanks in advance.
Regards, -- Steffen Persvold | Scalable Linux Systems | Try out the world's best mailto:sp@scali.com | http://www.scali.com | performing MPI implementation: Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.13.8 - Fax: (+47) 2262 8951 | N0621 Oslo, NORWAY | >320MBytes/s and <4uS latency
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