Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [rfc patch] i386: don't save eflags on task switch | Date | Sun, 5 Nov 2006 06:41:14 +0100 |
| |
> For me, when compiled with -O2, it results in > > 84 > 88 > 132 > > which basically says: a "rdtsc->rdtsc" is 84 cycles, putting a "pushfl" in > between is another _4_ cycles, and putting a "popfl" in between is about > another 48 cycles.
This means we should definitely change restore_flags() to only STI, never popf
-Andi - 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/
| |