On Mon, Jun 09, 2003 at 03:03:34AM -0700, David S. Miller wrote: > From: Andi Kleen <ak@suse.de> > Date: Mon, 9 Jun 2003 11:47:34 +0200 > > gcc will generate a lot better code for the memsets if you can tell > it somehow they are long aligned and a multiple of 8 bytes. > > True, but the real bug is that we're initializing any of this > crap here at all. Right now we write over the same cachelines > 3 or so times. It should really just happen once. It's unlikely to be the reason for the profile hit on a modern x86. They are all really fast at reading/writing L1. More likely it is the cache miss for fetching the lines initially. Perhaps it is cache thrashing the dst_entry heads. Adding a strategic prefetch somewhere early may help a lot. -Andi - : 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
