diff options
Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/network/597351')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/network/597351 | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/network/597351 b/results/classifier/deepseek-2-tmp/output/network/597351 deleted file mode 100644 index 9d80328c..00000000 --- a/results/classifier/deepseek-2-tmp/output/network/597351 +++ /dev/null @@ -1,31 +0,0 @@ - -Slow UDP performance with virtio device - -I'm working on an app that is very sensitive to round-trip latency -between the guest and host, and qemu/kvm seems to be significantly -slower than it needs to be. - -The attached program is a ping/pong over UDP. Call it with a single -argument to start a listener/echo server on that port. With three -arguments it becomes a counted "pinger" that will exit after a -specified number of round trips for performance measurements. For -example: - - $ gcc -o udp-pong udp-pong.c - $ ./udp-pong 12345 & # start a listener on port 12345 - $ time ./udp-pong 127.0.0.1 12345 1000000 # time a million round trips - -When run on the loopback device on a single machine (true on the host -or within a guest), I get about 100k/s. - -When run across a port forward using "user" networking on qemu (or -kvm, the performance is the same) and the default rtl8139 driver (both -the host and guest are Ubuntu Lucid), I get about 10k/s. This seems -very slow, but perhaps unavoidably so? - -When run in the same configuration using the "virtio" driver, I get -only 2k/s. This is almost certainly a bug in the virtio driver, given -that it's a paravirtualized device that is 5x slower than the "slow" -hardware emulation. - -I get no meaningful change in performance between kvm/qemu. \ No newline at end of file |