Subject: [linux-audio-dev] latencies! [Fwd: [PATCH] Recent VM fiasco - fixed]
From: Roger Larsson (roger.larsson_AT_norran.net)
Date: Fri May 12 2000 - 02:58:42 EEST
Found in linux-kernel/linux-mm
pre7-9 is Linus-2.3.99-pre7-9 == latest of the latest... :-(
More work will be done...
I will try to improve latencies...
/RogerL
"Juan J. Quintela" wrote:
>
> >>>>> "linus" == Linus Torvalds <torvalds_AT_transmeta.com> writes:
>
> Hi
>
> linus> On 11 May 2000, Juan J. Quintela wrote:
> >>
> >> I have done my normal mmap002 test and this goes slower than
> >> ever, it takes something like 3m50 seconds to complete, (pre7-8 2m50,
> >> andrea classzone 2m8, and 2.2.15 1m55 for reference).
>
> linus> Note that the mmap002 test is avery bad performance test.
>
> Yes, I know, I included it in the memtest suite not like a benchmark.
> I put the time results only for comparison. The important thing is
> that if we are running a memory hog like mmap002, we have very bad
> interactive performance. We swap the incorrect aplications (i.e. no
> mmap002 data).
>
> More in this sense is the test mmap001, this is one test that *only*
> mmaps a file the size of the physical memory and writes it (only one
> pass). Then closes the file. With that test in pre7-9 I got load 14
> and dropouts in sound (MP3 playing) of more than one second. And the
> interactive performance is *ugly*. The system is unresponsive while I
> run that, I am *unable* to change Desktops with the keyboard. You
> don't want to know about the jumps of the mouse. I think that we need
> to solve that problems. I don't mind that that aplication goes
> slower, but it can got so much CPU/memory. My system here is an
> Athlon 500Mhz with 256MB of RAM. This system is unable to write an
> mmaped file of 256MB char by char. That sound bad from my point of
> view.
>
> The tests in memtest try to found problems like that. I am sorry if
> it appears that I talk about raw clock time (re-reading my post I see
> that I made that point very *unclear*, sorry for the confusion).
>
> - - -
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