Messages in this thread | | | Subject | very poor TCP performance with 2.2.2 | From | Matt Ranney <> | Date | 24 Feb 1999 20:12:06 -0800 |
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I'm testing web server performance with the 2.2 kernels, and I'm seeing very poor results. All machines I'm testing are RedHat 5.2, Pentium 2 350's or 400's, eepro100's, plugged into their own port on a Bay switch, with full duplex forced in the driver. For clients I'm using either "zeusbench" or a multi-threaded connection-maker that I wrote. As servers, I'm using either stock Apache from RH 5.2 or "boa".
Going from 2.0.36 to 2.0.36, I'm getting around 2000 connections per second on a 2K request. Sometimes more, sometimes less, but performance seems very good to me. Here's what my program spits out:
In: Total Bytes:1104500 Average per request: 2209 (including response headers) Mb/s: 17.7952 Totals: Threads used: 4 Connections: 500 Seconds: 0.449559 Connection rate: 1112.2 connections/second
Requesting larger files and using more threads has yielded overall throughputs in excess of 80Mb/s, which is cool.
However, going from the same 2.0.36 machine to a 2.2.2 machine on the same switch results in this:
In: Total Bytes:1104500 Average per request: 2209 (including response headers) Mb/s: 0.183545 Totals: Threads used: 4 Connections: 500 Seconds: 43.5861 Connection rate: 11.4715 connections/second
Going from a 2.2.2 machine back to a 2.0.36 machine is much better, but still nowhere near as good as it should be:
In: Total Bytes:994050 Average per request: 2209 (including response headers) Mb/s: 2.32451 Totals: Threads used: 4 Connections: 450 Seconds: 3.01139 Connection rate: 149.433 connections/second
If this isn't a known bug, I'd be happy to get some tcpdumps or whatever else is required to track it down.
Thanks. -- Matt Ranney - mjr@ranney.com
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