On Mon, 23 Nov 2009 22:58:36 -0500 William Bourque <[email protected]> wrote: > Larry Finger wrote: > > One last check. I would appreciate receiving answers to the > > following questions. These questions apply to anyone else with this > > problem. > > > > Does the pm_qos patch help your "fatal DMA error" problem, > > particularly when booted from power-off? > > > > If you warm-boot after loading the wl driver, does the patch make > > any difference? > > > > Larry > > Hi > > I run a test case scenario on my notebook to figure out the QOS patch > effect on the card reliability. > I would say that the results are not very conclusive, but it seems the > patch helped slightly, but not very time. > > To explain the methodology, I ran 4 series of test (Cold boot and warm > boot, on battery and pluged in) between a patched and unpatched > wireless-testing kernel. > The time in the sheet is the time between the first line of the load > of the firmware (b43 ssb0:0: firmware: requesting b43/ucode15.fw) to > the first DMA error (b43-phy0 ERROR: Fatal DMA error: ) > Three time, the card crashed but not DMA error were printed in the > log. In that case, the line about the interface failing (b43-phy0 > debug: Wireless interface stopped) were used instead. > The "time" is taken accordingly to kernel timestamp printed by dmesg. > > Note that this test was design to make the card fails quickly. As soon > as the card was up, the full kernel tree was transfert over a wireless > LAN, as it has been observed before that fast rate transfert were good > at crashing DMA. (I tried "ping -f 172.16.0.1" before but the card was > still alive after 5 minutes). > Technically the following command was run : ifup wlan0 && scp -r > /usr/src/linux 172.16.0.1:~/ > > > The result seems to show that the patch has no effect on warm-booted > system but it seems to make the card slightly more reliable on > cold-booted system, with an average time before crashing of 24.07 > (patched cold boot) vs 22.98 (unpatched coldboot).
William, Out of interest (I am not a b43 developer), was the warm boot a warm boot from a kernel with the proprietary wl driver installed, and if so does the wl driver work for you? Chris _______________________________________________ Bcm43xx-dev mailing list [email protected] https://lists.berlios.de/mailman/listinfo/bcm43xx-dev
