From: Nick Piggin <[EMAIL PROTECTED]> Date: Wed, 14 Nov 2007 05:14:27 +1100
> On Wednesday 14 November 2007 17:12, David Miller wrote: > > Is your test system using HIGHMEM? > > > > That's one thing the page vector in the sk_buff can do a lot, > > kmaps. > > No, it's an x86-64, so no highmem. Ok. > What's also interesting is that SLAB apparently doesn't have this > condition. The first thing that sprung to mind is that SLAB caches > order > 0 allocations, while SLUB does not. However if anything, > that should actually favour the SLUB numbers if network is avoiding > order > 0 allocations. > > I'm doing some oprofile runs now to see if I can get any more info. Here are some other things you can play around with: 1) Monitor the values of skb->len and skb->data_len for packets going over loopback. 2) Try removing NETIF_F_SG in drivers/net/loopback.c's dev->feastures setting. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
