Messages in this thread | | | Date | Thu, 23 Mar 2006 02:24:25 +0100 | From | "Alessandro Suardi" <> | Subject | [2.6.16-gitX] heavy performance regression in ipw2200 wireless driver |
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Driver - or firmware ? Don't know - since the new git snapshots run 1.1.1 which requires newer firmware from http://ipw2200.sourceforge.net.
Symptom -> my new FC5 partition with 2.6.16-git kernels connects via VNC viewer to my bittorrent box over wireless (ipw2200 to a D-Link G604T router/AP); Dell D610 runs FC5, BT box is a K7-800 running FC3 with a 2.6.16-rc5-git8 kernel (15+ days uptime...).
I also run Firefox on the bittorrent box; noticed today (2.6.16-git5) that the screen refresh of pages with images was from time to time very slow (close to unusable).
Rebooted into my FC4 partition with a 2.6.16 kernel, everything much snappier. So I ran a scp test from my BT server to the laptop, three times in a row the same file - a 38MB .flac with the laptop in the same physical position (ie, no signal variation). Results...
FC5 - 2.6.16-git3:
[asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 971.3KB/s 00:40 [asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 1.3MB/s 00:29 [asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 626.7KB/s 01:02
FC4 - 2.6.16:
[asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 1.5MB/s 00:25 [asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 1.7MB/s 00:23 [asuardi@donkey melua_2004-09-23_Berlin]$ scp KM_9-23-04_17_The\ Closest\ Thing\ to\ Crazy.flac 192.168.1.8:/tmp asuardi@192.168.1.8's password: KM_9-23-04_17_The Closest Thing to Crazy.flac 100% 38MB 1.7MB/s 00:22
Bottom line - old driver has better performance than the new one, but most noticeably delivers consistent performance.
I will be available for testing starting Thursday 30th as I'll be on the road since then. Of course if the problem is identified and fixed earlier, I won't cry ;)
Thanks,
--alessandro
"Dreamer ? Each one of us is a dreamer. We just push it down deep because we are repeatedly told that we are not allowed to dream in real life" (Reinhold Ziegler) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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