On Fri, Dec 29, 2000 at 07:13:28PM +0100, Jakob Østergaard wrote:
> > > It can't scale in SMP.
> >
> > No one said it does, but it works nicely on UP.
>
> What ?
Maybe you got me wrong (my english isnt that good): I said that it does
not scale on SMP, but it works just fine on UP.
> The TCP stack is threaded, so things like checksum calculation will
> take advantage of multiple processors - right ?
Wrong. "Threaded" TCP/IP stack -> fine grained locking, not "multiple
threads".
> Thes rest of the work is roughly copying data that isn't already
> cached from the disk into memory. Well, you have one disk so threads
> will buy you zero there.
>
> Unless you do blocking I/O on the files or on the sockets, I fail to
> see how threads could possibly boost the performance on a web server
> that serves *static*only* pages.
They do boost performance on SMP (because you can have N (N=nr. of CPUs)
threads serving data).
> (The reason I'm curious is because I'm about a month away from implementing
> something that would run high-bandwidth TCP transfers and I'm planning
> on keeping it single-threaded - unless someone can tell me that's a bad
> idea)
Keep it single threaded if you run on UP only...
-- Petru Paler, mailto:ppetru@ppetru.net http://www.ppetru.net - ICQ: 41817235 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Dec 31 2000 - 21:00:12 EST