[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] net/core: Order-3 frag allocator causes SWIOTLB bouncing under Xen
On Thu, Sep 05, 2013 at 08:39:06AM +0100, Ian Campbell wrote: > On Wed, 2013-09-04 at 17:11 -0400, Konrad Rzeszutek Wilk wrote: > > On Wed, Sep 04, 2013 at 02:00:40PM -0700, Eric Dumazet wrote: > > > > Maybe you could add proper infrastructure to deal with Xen limitations. > > > > I think Ian posted at some point an sysctl patch for that (more for > > debugging that anything else). And it kind > > of stalled: > > http://lists.xen.org/archives/html/xen-devel/2012-10/msg01832.html > > I think I though you were looking into it from the swiotlb angle? Yes. I didn't find anything immediately obvious - but I can still reproduce with an skge DMA issues when booting baremetal with 'swiotlb=force'. But only under 32-bit. I think there is some physical address truncation with the new compound size skb's. Obviously needs further investigation. > > In any case I don't have time to look into this further. > > > Is that what you mean by proper infrastructure ? > > > > Oh wait, did you mean via dev and not the whole system wide sysctl? > > The system wide sysctl was not acceptable AFAIR, which seems reasonable. <nods> > > Per-dev is hard because it affects the native drivers for each physical > NIC when running under Xen, not the Xen PV NIC which we fixed by > splitting compound frags into separate slots on the PV ring. Right. Thank you for pointing that obvious issue. > > Ian. > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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