Messages in this thread | | | Date | Wed, 22 Mar 2006 19:10:57 -0800 | From | Andrew Morton <> | Subject | Re: [2.6.16-gitX] heavy performance regression in ipw2200 wireless driver |
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"Alessandro Suardi" <alessandro.suardi@gmail.com> wrote: >
Pleeeeze try to cc the right people.
> 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 ;)
Well. It's not a huge regression. It's a 50%ish regression. We've done worse ;)
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