Hi Anton, On Thu, Sep 09, 2010 at 01:57:50AM +0400, Anton Vorontsov wrote: > Thanks! > > Would be also great if you could point out which patch causes > most of the performance drop (if any)? > > Albert, if you could find time, can you also "bisect" the > patchset? I wouldn't want to buy Nintendo WII just to debug the > perf regression. ;-) FWIW, I tried to disable multiblock > read/writes and test with SD cards, and still didn't notice > any performance drops. > > Maybe it's SDIO IRQs that cause the performance drop for the > WII case, as we delay them a little bit? Or it could be the > patch that introduces threaded IRQ handler in whole causes > it. If so, I guess we'd need to move some of the processing to > the real IRQ context, keeping the handler lockless (if > possible) or introducing a very fine grained locking. I didn't know anything about a reported performance drop, and I don't think Andrew did either -- Albert's test results don't seem to have made it to this list, or anywhere else that I can see. Could you link to/repost his comments? (I'll be testing with libertas, so that will stress-test SDIO IRQs.) Thanks, -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
