Messages in this thread | | | Date | Tue, 2 Jun 2009 21:06:41 +0300 | Subject | Re: [benchmark] 1% performance overhead of paravirt_ops on native kernels | From | Pekka Enberg <> |
| |
Hi Chris,
On Tue, Jun 2, 2009 at 6:03 PM, Chris Mason <chris.mason@oracle.com> wrote: >> I find it ridiculous to use the "but it's used" argument to try to >> force the code into the kernel. By this argument you can say the same >> about crap like ndiswrapper and similarly harmful code. > > I'm not saying to take harmful code, I'm saying to take code with a > small performance regression under a specific CONFIG_. Slub regresses > more than 1% on database loads, CONFIG_SCHED_GROUPS, the list goes on > and on.
Maybe it's just me but you make it sound like the SLUB regression is okay. It's not.
Unfortunately we're now in a position where we can't just remove SLUB (it's an improvement over SLAB for NUMA) so we're stuck with two allocators with third one on its way to the kernel. So yes, it makes a lot of sense to me to fix CONFIG_PARAVIRT regression before merging more of the xen stuff in the kernel. It's always easier to fix these things before they hit the kernel and people start to depend on them.
Pekka -- 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/
| |