On Thu, Nov 29, 2012 at 1:56 PM, Vadim Rozenfeld <vrozenfe@xxxxxxxxxx> wrote: >> I've also added +hv_relaxed since then, but this is the command I'm > > I would suggest activating relaxed timing for all W2K8R2/Win7 guests. Is there any place I can read up on the downsides of this for Linux, or is Just Better? >>>> Other than that, was looking into a profiling trace of the software >> running and a lot of time (60%?) is spent calling two functions from >> hal.dll, HalpGetPmTimerSleepModePerfCounter when I disable HPET, and >> HalpHPETProgramRolloverTimer which do point at something related to >> the timers. >> > It means that hyper-v time stamp source was not activated. I recompiled the whole kernel, with your patch, and while I cannot check at 70Mbps now, a test stream of 20 seems to do better. Also, now I don't see any of those functions, which used to account ~60% of the time spent by the program. I'm waiting for the customer to come back and start the 'real' stream, but from my tests, time spent in hal.dll is now an order of magnitude smaller. -- George-Cristian Bîrzan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
