![]() | ||||||||||
Messages in this thread |
On Tue, 29 Jan 2002, Pavel Machek wrote: > > so it appears that this lowlevel x86 performance bug(?) is more than 11 > > years old! :-) > > Probably 386's were not optimized for %fs==%gs==0 case? > > BTW does it really make a difference for the CPU? whether %fs/%gs is 0 or not? With the current 2.5.3-pre6 task switching code there definitely is a performance difference, because we optimize the 'both values are 0' case. With the original TSS-based task switching microcode i suspect it made a difference as well. (switching between two different %fs/%gs values should be slower.) Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
| Last update: 2005-03-22 11:16 [W:0.338 / U:0.510 seconds] ©2003-2008 Jasper Spaans | ||||||||||