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 220.127.116.11 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
18.104.22.168 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: