Messages in this thread | | | From | Andy Lutomirski <> | Date | Fri, 21 Nov 2014 11:52:27 -0800 | Subject | Re: frequent lockups in 3.18rc4 |
| |
On Fri, Nov 21, 2014 at 11:46 AM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Fri, Nov 21, 2014 at 11:34 AM, Linus Torvalds > <torvalds@linux-foundation.org> wrote: >> >> So I kind of agree, but it wouldn't be my primary worry. My primary >> worry is actually paravirt doing something insane. > > Btw, on that tangent, does anybody actually care about paravirt any more? >
Amazon, for better or for worse.
> I'd love to start moving away from it. It makes a lot of the low-level > code completely impossible to follow due to the random indirection > through "native" vs "paravirt op table". Not just the page table > handling, it's all over. > > Anybody who seriously does virtualization uses hw virtualization that > is much better than it used to be. And the non-serious users aren't > that performance-sensitive by definition. > > I note that the Fedora kernel config seems to include paravirt by > default, so you get a lot of the crazy overheads..
I think that there is a move toward deprecating Xen PV in favor of PVH, but we're not there yet.
--Andy
| |