On Sat, Aug 25, 2001 at 10:33:36PM +0100, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> > exactly this is a point: my disk can do 5mb/s with almost random seeks,
> > and linux indeed reads 5mb/s from it. but the userpsace process doing
> > read() only ever sees 2mb/s because the kernel throes away all the nice
> > pages.
>
> Which means the VM in the relevant kernel is probably crap or your working
> set exceeds ram.
The relevant kernel is linux (all 2.4 versions I tested), and no, working
set exceeding ram should never result in such excessive thrashing. So yes,
the VM in the kernel is crap (in this particular case, namely high-volume
fileserving) ;)
-- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg@goof.com |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | | - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:19 EST