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Re: XEON SMP KERNEL 2.4.20 tree

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Hi again,

How long have those machines been online?
$ uptime
 11:14:51 up 8 days, 21:46,  1 user,  load average: 0.00, 0.03, 0.00
$ uname -a
Linux data 2.4.21-rc6 #1 SMP Tue Jun 3 12:46:45 CEST 2003 i686 unknown

There is a discussion about the 2.4.21rc kernels on the SE Linux mailing list. Machines running 2.4.21rc kernels seem to have a kernel memory leak which makes them unusably slow. Opinion is divided on whether this is a kernel issue or a SE Linux issue. I don't believe that it is SE Linux at fault as
the SE code we are using is a straight port from 2.4.20 (and should run
equally well as on 2.4.20). However other people have seen some evidence to suggest that the problem may only occur on SE Linux machines (I don't run any
non-SE machines at the moment for testing).
With the 2.4.20 kernel, this machine froze up to 2 times per day. As you can see, its now operational for more than a week and doesn't have any problems. About the performance, I cannot make an informed comment, since this is our NFS-Server and the machine performs as well
as it did before. So .. for me, it does do as well as before.

Ok .. just for a quick comparison I compiled a stock 2.4.20 kernel on 2 machines (one with 2.4.19, one with 2.4.21rc6 kernels running). The machines are xSeries 340 DP with 1 GHz CPUs, 1 GIG of RAM and 36 GIG SCSI HDs, onboard AIC controller.

$ time make -j3 bzImage
Machine running 2.4.19
real    2m18.895s
user    4m2.760s
sys     0m16.810s

Machine running 2.4.21rc6
real    2m18.842s
user    4m12.920s
sys     0m16.370s

So .. again .. I cannot say that the performance has changed in any way.

- - Cheers, Peter

- --
  Dipl.-Ing. Peter Burgstaller
  Technical Director
  @ all information network & services gmbh
  email: peter.burgstaller@ains.at
  phone: +43 662 452335
fax : +43 662 452335 90 -----BEGIN PGP SIGNATURE-----
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