Re: XEON SMP KERNEL 2.4.20 tree

[DI Peter Burgstaller <peter.burgstaller@ains.at>]

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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 
                    
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