[removed virtio-dev -- I'm sick of bounces] On Thu, Aug 28, 2014 at 11:55 AM, Paolo Bonzini <[email protected]> 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 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
