On 10/18/2015 2:07 PM, Christoffer Dall wrote: > On Mon, Oct 12, 2015 at 09:29:23AM -0700, Mario Smarduch wrote: >> Hi Christoffer, Marc - >> I just threw this test your way without any explanation. > > I'm confused. Did you send me something somewhere already? Yes in the last patchset https://lists.cs.columbia.edu/pipermail/kvmarm/2015-October/016698.html I included a simple test I put together. > >> >> The test loops, does fp arithmetic and checks the truncated result. >> It could be a little more dynamic have an initial run to >> get the sum to compare against while looping, different fp >> hardware may come up with a different sum, but truncation is >> to 5'th decimal point. >> >> The rationale is that if there is any fp/simd corruption >> one of these runs should fail. I think most likely scenario >> for that is a world switch in midst of fp operation. I've >> instrumented (basically add some tracing to vcpu_put()) and >> validated vcpu_put gets called thousands of time (for v7,v8) >> for an over night test running two guests/host crunching >> fp operations. >> >> Other then that not sure how to really catch any problems >> with the patches applied. Obviously this is a huge issues, if this has >> any problems. If you or Marc have any other ideas I'd be happy >> to enhance the test. > > I think it's important to run two VMs at the same time, each with some > floating-point work, and then run some floating point on the host at the > same time. > > You can make that even more interesting by doing 32-bit guests at the > same time as well. Yes that's the test combination I've been running. > > I believe Marc was running Panranoia > (http://www.netlib.org/paranoia/paranoia.c) to test the last lazy > series. I'll try this test and run it for several days, see if anything shows up. Thanks. > > Thanks, > -Christoffer > -- 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
