Messages in this thread | | | Subject | Re: 2.2.0-pre[56] swap performance poor with > 1 thrashing task | From | Zlatko Calusic <> | Date | 09 Jan 1999 07:32:49 +0100 |
| |
Dax Kelson <dkelson@inconnect.com> writes:
> On 7 Jan 1999, Zlatko Calusic wrote: > > > > 1) Swap performance in pre-5 is much worse compared to pre-4 in > > *certain* circumstances. I'm using quite stupid and unintelligent > > program to check for raw swap speed (attached below). With 64 MB of > > RAM I usually run it as 'hogmem 100 3' and watch for result which is > > recently around 6 MB/sec. But when I lately decided to start two > > instances of it like "hogmem 50 3 & hogmem 50 3 &" in pre-4 I got 2 x > > 2.5 MB/sec and in pre-5 it is only 2 x 1 MB/sec and disk is making > > very weird and frightening sounds. My conclusion is that now (pre-5) > > system behaves much poorer when we have more than one thrashing > > task. *Please*, check this, it is a quite serious problem. > > I just tried this on 2.2.0-pre6 PentiumII 412Mhz, 128MB SDRAM, one IDE > disk (/ & swap). > > ./hogmem 200 3 > Memory speed: 9.01 MB/sec > > ./hogmem 100 3 & ./hogmem 100 3 > Memory speed: 0.96 MB/sec > Memory speed: 0.96 MB/sec >
I have a fix for this, together with a great improvement in swapping speed that I'll be sending in few moments, after some final testing.
pre6 is VERY good, and with my changes, we will have fastest MM ever! -- Zlatko
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |