On Thu, Aug 28, 2014 at 12:18 PM, Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote: > On 28/08/14 21:03, Andy Lutomirski wrote: >> [removed virtio-dev -- I'm sick of bounces] >> >> On Thu, Aug 28, 2014 at 11:55 AM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: >>> Il 28/08/2014 20:29, Christian Borntraeger ha scritto: >>>>>>>> block seems to work, with net a simple ping works, iperf causes this: >>>>>> >>>>>> I neither see the bug, nor can I reproduce it on x86_64 on KVM. I >>>>>> doubt that dma vs. non-dma is relevant. I tried -net user a -net tap >>>>>> with iperf running in both directions. I also tried switching >>>>>> virtio_pci into non-DMA-API mode. No errors. >>>>>> >>>>>> Is there any chance that you could instrument that BUG_ON to print n, >>>>>> i, in_sgs, out_sgs, total_sg, total_in, and total_out? I assume this >>>>>> is some oddity with patch 1, but I'm mystified. >>>> Yes, its triggered by patch 1. >>> >>> What version of QEMU? Can you two cat the "features" file in the >>> virtio-net device's sysfs directory? >> >> With vhost=on: >> >> # cat /sys/class/net/eth0/device/features >> 0000011000000001111101010001110000000000000000000000000000000000 > > >> Without vhost=on: >> >> # cat /sys/class/net/eth0/device/features >> 0000011000000001111101010001110000000000000000000000000000000000 >> >> Instrumenting the code says that indirect=1. >> >> --Andy >> > > I have > > 1100011111111111111101010001110000000000000000000000000000000000 > I still can't reproduce it, but I think I see the problem. I'm going to rearrange the patch series so that patch 1 is at the end in case it causes additional issues. v3 coming soon. --Andy -- Andy Lutomirski AMA Capital Management, LLC _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
