On 03/16/2018 02:05 PM, Matthew Wilcox wrote: > > Obviously if the problem turns out to be the cacheline thrashing rather > than the call to page_to_virt, then this is pointless to test. > >> I won't be able to test the patches until next week, but I expect I >> will probably see a noticeable regression when performing a small >> packet routing test. > > I really appreciate you being willing to try this for me. I need to > get myself a dual-socket machine to test things like this. >
It seems my prior mail/answer was lost. Issue is cacheline thrashing indeed, particularly on PowerPC (64 KB pages)
