On 05/04/02 00:29, Andrew Morton wrote:
> Ricardo Galli wrote:
> > Hi all (second try),
> > Linux becomes somehow unusable when I edited sound files and also
> > during NFS copy. I've noticed the same effects also during i/o loads, for
> > example when closing kmail after I deleted some messages.
>
> It would help if you could come up with a simple test case
> which exhibits this problem - some sequence of steps which
> is reproducible by others, and which has repeatable effects.
To test computer A, which has installed Linux 2.4.18 + all low latency
patches.
1. Put ten (10) to twenty (20) files of 64-80 MB each in computer B. For
example in /tmp/test.
2. Mount in B a disk in A via NFS in, for example, /mnt/A
3. In B, run the following command:
cp /tmp/test/* /mnt/A
4. Check in A how you mouse freezes.
If you are a Debian Sid user, don't do any dist-upgrade for a couple of days
and then try it. You will see the same mouse freezes when apt-get is
installing/configuring packages.
> Is your I/O system performing properly? Try running
>
> hdparm -t /dev/hdaX
>
> where /dev/hdaX refers to your root filesystem. You
> should get 15-30 megabytes per second.
Yes.
# hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 64 MB in 2.32 seconds = 27.59 MB/sec
> You also report that your PPC-based laptop has processes
> unexpectedly terminating when the machine is under VM
> pressure. You should check your kernel logs (usually
> /var/log/messages) to see if the process was killed
> due to an out-of-memory condition. If it's not that,
> and if it's not due to application bugs then the ppc
> kernel may be dropping modified- or dirty-bits in its
> PTEs, which is rather unlikely.
The PPC hasn't any problem at all, it was the NFS server who has killed
kmail. There were not logged messages at all.
Regards,
--
ricardo
"I just stopped using Windows and now you tell me to use Mirrors?"
- said Aunt Tillie, just before downloading 2.5.3 kernel.
-
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This archive was generated by hypermail 2b29 : Sun Apr 07 2002 - 22:00:16 EST