Messages in this thread | | | Date | Fri, 07 Mar 2003 12:12:50 +0100 | From | (Margit Schubert-While) | Subject | Re: [RFC] i386-arch fixes/enhancements |
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Nice to see somebody is pushing this. I am getting fed up wtih applying these to every 2.4.xx. Note that with GCC >= 3.x(Not sure about "x", definitely 3.2), the P4 compile option correctly generates add/sub instructions instead of the "P4 killer" inc/dec. Of course, in include/asm-i386, we still have incs/decs in processor.h, atomic.h, rwsem.h, semaphore.h uaccess.h, system.h, string.h, spinlock.h and smplock.h. With the patches and changing the includes, I can get a 5-10% improvement with a hefty DB app on a UP P4 which isn't to be sneezed at. And perhaps somebody should take a squint at the "copy_xxx_user". IMHO, this really should be inlined. Try running a DB app which bounces semaphores at a terrific rate and what do you see at the top of readprofile ? Yep, you guessed it.
Margit
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