Re: 2.1.32 - performance problems

Peter Leif Rasmussen (peter@udgaard.isgtec.com)
Sun, 6 Apr 1997 20:39:41 -0400


Hari wrote:
>> I'll second that, and will extend that to the latest 2.1.x kernels. At least
>> since 2.1.26 have the performance been slower than on 2.0.29. For example a
>> 2.0.29 kernel compile with a 2.0.29 kernel:
>
>Have you disabled SMP?
>
>Since 2.1.27, the distributed Makefile comes with SMP enabled, ie,
>there's a line
>
> SMP = 1
>
>in the Makefile.
>

Thank you very much for your suggestion, which might have been valid. As you
did mention, it wasn't until linux 2.1.27 that the SMP flag was set as a
default, and I had noted in my previos mail that even since 2.1.26 I thought
that there was a slowdown.

I also copy this message to the list, so others may see that it is not an
erroneus setting of the SMP flag that caused this. I don't thereby excluse
other erroneus behaviour, but haven't yet seen anything that would suggest
that.

This is a good opportunity to say:

Always check the top Makefile (makefile) before you start building!
-- unknown
Thanks,

Peter

--
main(){char*s="O_>>^PQAHBbPQAHBbPOOH^^PAAHBJPAAHBbPA_H>BB";int i,j,k,l,m,n;
for(j=0;j<7;j++)for(l=0;m=l-6+j,i=m/6,n=j*6+i,k=1<<m%6,l<41-j;l++)
putchar(l<6-j?' ':l==40-j?'\n':k&&s[n]&k?'*':' ');}