On Mon, 2012-09-24 at 12:12 -0700, Linus Torvalds wrote: > On Mon, Sep 24, 2012 at 11:26 AM, Mike Galbraith <efa...@gmx.de> wrote: > > > > Aside from the cache pollution I recall having been mentioned, on my > > E5620, cross core is a tbench win over affine, cross thread is not. > > Oh, I agree with trying to avoid HT threads, the resource contention > easily gets too bad. > > It's more a question of "if we have real cores with separate L1's but > shared L2's, go with those first, before we start distributing it out > to separate L2's".
Oh absolutely, if you have cores with shared L2, that's _the_ way to go, shared L2 is lovely, and what select_idle_sibling() was originally all about. Westmere manages to cough up a tbench win without that. Heck, I generated some numbers for Borislav yesterday showing the thing winning at _netperf TCP_RR_, one byte synchronous ping pong. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
