Use the stock kernel. I'd like to see some benchmarks that show recompiling the kernel is worthwhile for desktops, (Servers have other issues.) User:Hey sysadmin this kernel is 5% faster, but it locks up every 2 weeks. Come and fix it.... I'd rather just have a kernel that works, computers are disk-bound anyways, recompiling with a few extra optimizations just isn't worthwhile. > --Luke > --Computer Science Sysadmin, MSU Bozeman > --admin(AT)cs.montana.edu 994-3931 > -----Original Message----- > From: psyche-list-admin@redhat.com [mailto:psyche-list-admin@redhat.com] > On Behalf Of Jakub Jelinek > Sent: Wednesday, October 23, 2002 3:36 PM > To: psyche-list@redhat.com > Subject: Re: i386 kernel not included? > > On Wed, Oct 23, 2002 at 11:51:46AM -0500, Thomas Dodd wrote: > > > > > > Thomas Dodd wrote: > > > But if most pre i686 CPUS (pre PPro/PII/Athlon) run the i386 code > > > mix faster than the pentium mix, why not supply the i386 mix. > > > I woul thing there are more 486s, P/MMX, K5, K6, and Cyrix CPUs > > > still in use than Pentiums (pre MMX). > > > > > > A test using a simple C source file: > > > > -march=i386 -mcpu=i586 and -march=i586 -mcpu=i586 > > were the same. > > > > -march=i386 -mcpu=i586 and -march=i386 -mcpu=i686 > > had a lot of differences. The instruction mix was very different. > > > > -march=i386 -mcpu=i586 and -march=i386 -mcpu=athlon > > Very different to. > > > > -march=i386 -mcpu=i686 was the same as -march=i386 -mcpu=athlon > > Most interesting to me, > > The mix is different. > > > > example > > i686 athlon > > movl -24(%edp), %edx andl -24(%edp), %eax > > andl %edx, %eax > > > > > > movl %eax, %edx imull $100, %eax, %edx > > movl %edx, %eax > > sall $2, %eax > > addl %edx, %eax > > leal 0(,%eax,4), %edx > > addl %edx, %eax > > leal 0(,%eax,4), %edx > > Do you have testcase and exact options for this? > $edx = 100*$eax is with -O2 -mcpu=i686: > leal (%eax,%eax,4), %edx > leal (%edx,%edx,4), %edx > sall $2, %edx > for me. > > Jakub > > > > -- > Psyche-list mailing list > Psyche-list@redhat.com > https://listman.redhat.com/mailman/listinfo/psyche-list -- Psyche-list mailing list Psyche-list@redhat.com https://listman.redhat.com/mailman/listinfo/psyche-list
