David S. Miller writes: > But Robert, do you know "why" the dst management doesn't show up in > your profiles when you rip-out the rtcache? > > It's because to total number of DST entries is so small that they all > fit in the cpu cache. When the rtcache is enabled and we thus have up > to "max_size" DST entries in flight at all times, the dst management > routines show up very clearly because they have a high probability of > missing the cpu cache. > > In particular, have a good look at Simon's profiles. dst_alloc() is > quite near the top there. Yes and that was the intention to get pretty close to pure slowpath. As a result I/we now appreciate the hash better... Cheers. --ro - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
