Atsushi Nemoto wrote: > >>>>> On Mon, 19 Sep 2005 17:40:56 +0200, Thiemo Seufer <ths@xxxxxxxxxxxx> said: > > ths> I found an performance bug in c-r4k.c:r4k_dma_cache_inv, where a > ths> Hit_Writeback_Inv instead of Hit_Invalidate is done. Ralf > ths> mentioned this is probably due to broken Hit_Invalidate cache ops > ths> on some CPUs, does anybody have more information about this? The > ths> appended patch works apparently fine on R4400, R4600v2.0, R5000. > > Just a question: Are there any performance advantage of using > Hit_Invalidate instead of Hit_Writeback_Inv if the target line was > CLEAN? I wouldn't think so, but it depends on the particular implementation. Thiemo
