On Thu, 2013-12-12 at 22:08 +0000, Zoltan Kiss wrote: > On 28/11/13 17:43, Ian Campbell wrote: > > On Thu, 2013-11-28 at 17:37 +0000, Zoltan Kiss wrote: > > Routing/firewalling domUs is as valid as bridging. There is nothing in > > the slightest bit suboptimal about it. > > > > If this use case regresses with this approach then I'm afraid that > > either needs to be addressed or a different approach considered. > > > >> Anyway, I will try this out, and see if it really copies everything, and > >> get some numbers as well. > > > > Thanks. > > Now I managed to try it out. As I expected, Dom0 does copy the mapped > page. The peak throuhput I could get was 6.6 Gbps, however it could keep > that only for short periods, I guess when the unmapping was ideally > batched. The average was 5.53. > On the same machine the same 10 min iperf session, without my patches > made the peak 5.9 while the average was 5.65. Do you think it is an > acceptable regression?
Well, it would of course be preferable to avoid it. I'm quite reluctant to see this scenario become a second class citizen. > I used 3.12 Dom0 and guest kernel, the guest transmitted though a 10Gb > card to a bare metal box. > I plan to look further if we can avoid somehow this: > > https://lkml.org/lkml/2012/7/20/363 > > So then this scenario can benefit from grant mapping. > > Regards, > > Zoli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
