[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] domU to domU networking issues in v3.7? (netserver/netperf failing to communicate)
Monday, November 12, 2012, 3:28:35 PM, you wrote: > On Mon, Nov 12, 2012 at 09:54:44AM +0000, Ian Campbell wrote: >> On Sat, 2012-11-10 at 13:59 +0000, Konrad Rzeszutek Wilk wrote: >> > Hey Ian, Xen-devel mailingl list, >> > >> > I think the issue of 70% traffic lost was actually introduced in v3.6 or >> > perhaps v3.5. Annie and Marcos (CC-ed here) are looking to see which of >> > the releases introduced this. The issue we are seeing is that a domU >> > to domU communication breaks - this is with netperf/netserver talking to >> > each other. >> > >> > Anyhow, I think the 3.7 compound page exacerbated the problem and also >> > (at least on some of my test hardware) exposed existing issues with >> > drivers. The issue I have is that the 'skge' driver has a bug that has >> > been there for ages (I tested way back to 3.0 and still saw it) were it >> > can not work with SWIOTLB. It is probably missing an pci_dma_sync >> > somewhere. >> > >> > Anyhow the compound page got me to look at Xen-SWIOTLB and that looks >> > OK. Even with synthetic driver (the fake one I posted somewhere) it >> > dealt with compound pages properly (with debug or non-debug Xen >> > hypervisor). >> >> The debug build is probably most interesting since it deliberately >> allocates a non 1-1 p-to-m mapping so as to catch exactly these sorts of >> issues. > Right. My test env runs with that. And so far it only has issues > with the skge one. >> >> > So was wondering if you had looked at this in more details? Any >> > ideas? Or would it be more prudent to ask that once we know for sure >> > which Linux release introduced the communication failures between >> > guests? >> >> I've not looked at it any further I'm afraid. >> >> If these changes (be they in 3.5 or later, or earlier) are exposing >> driver bugs then I suspect the netdev chaps would want to know about it. > Right. Annie (CC-ed here) mentioned to me that v3.5 looks to work ok. > And is off checking v3.6. v3.7 is definitly a no go. >> >> FWIW I see the issue with tg3. After the issues with netback where fixed, I'm seeing the issues with net_front reverting the single commit 5640f7685831e088fe6c2e1f863a6805962f8e81 (that was pointed out for netback) also makes these disappear. I haven't seen issues with netfront and netback before this commit. FWIW: the hardware nics in this machine are two r8169 's. -- Sander > I should double-check that but I didn't get any issues with the tg3 I had. > I was running the netperf/netserver from/to to see if I could reproduce the > issues (70% loss) you described but did not have much luck. >> >> Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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