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Diffstat (limited to 'results/scraper/launchpad-without-comments/1556306')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1556306 | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1556306 b/results/scraper/launchpad-without-comments/1556306 new file mode 100644 index 00000000..b88cd42a --- /dev/null +++ b/results/scraper/launchpad-without-comments/1556306 @@ -0,0 +1,24 @@ + vhost-user: qemu stops processing packets under high load of traffic + +Description of problem: +- qemu socket becomes full, causing qemu to send incomplete +SET_VRING_CALL messages to vhost-user backend (without proper fd set in +ancillary data). +- after some time, some interrupts are lost, causing the VM to stop +transmitting packets. + +How reproducible: +Run a stress tests of a vhost-user interface using an UDP +traffic generator. Traffic generator (IXIA) was connected to 2 physical ports that are in turn connected to 2 virtio ports through a linux bridge, VM +(running linux) doing routing to forward packets between the 2 virtio ports. +When traffic reaches high pps rates of small packets, + +Actual results: +- VM stop transmitting packets + +Expected results: +- VM should never stop transmitting packets + +Additional info: +We do propose a fix at: + http://lists.nongnu.org/archive/html/qemu-devel/2015-12/msg00652.html \ No newline at end of file |