On 2011-09-13 11:18, Mark Salter wrote: >> On 2011-09-13 10:18, Mark Salter wrote: >>> The big write performance hits are worrisome, though. I'd be good to >>> test on one kernel version with and without the patch just to make sure. >>> Also comparing SD performance with and without nosmp passed on cmdline >>> would be interesting. > > I already have a good idea what the results will look like for usb, so > just the other four with sd-card. I tested 2.6.40.3 with and without the DMA API patch set, and with and without the nosmp cmdline option. The good news: the DMA API patch set does not seem to be responsible for the slow-down in SD card performance, it was equally slow with all 2.6.40.3 variants. The bad news: some other change between 2.6.35 and 2.6.40 must be responsible, so there's a lot of bisecting to do. See the bonnie++ results at: http://jeffbastian.blogspot.com/2011/09/sd-card-speeds.html Jeff _______________________________________________ arm mailing list arm@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/arm
