virtio net bugfixes and performance improvement #149
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Since bug https://bugs.passt.top/show_bug.cgi?id=74 is now fixed in passt, it is now became possible to test with small socket buffers, doing so revealed this mistake. Signed-off-by: Matej Hrica <mhrica@redhat.com>
Previously when write_loop was called by try_finish_write and it wrote something to the socket (but not fully finish the current frame), it would set last_partial_write_length to an incorect value. This commit also changes the type of last_partial_write_length to usize from, Option<NonZeroUsize> because it seems to be simpler to work with. Signed-off-by: Matej Hrica <mhrica@redhat.com>
Signed-off-by: Matej Hrica <mhrica@redhat.com>
mtjhrc
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The clippy issues seem to be fixed in #148 so not fixing them in this PR. |
With the default small socket buffer sizes of 204KiB, this seems to masively improve iperf3 TCP upload from guest to host. The throughput is now around 33 Gbits/sec instead of 130 Mbits/sec. To set the socket buffer sizes you can use: $ sudo sysctl -w net.core.rmem_max=$((204*1024)) -w net.core.wmem_max=$((204*1024)) Tested with passt version: 0^20231004.gf851084-1.fc38.x86_64 Signed-off-by: Matej Hrica <mhrica@redhat.com>
Signed-off-by: Matej Hrica <mhrica@redhat.com>
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@mtjhrc LGTM, could you please force-push this PR to retrigger the checks? |
Signed-off-by: Matej Hrica <mhrica@redhat.com>
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Signed-off-by: Matej Hrica <mhrica@redhat.com>
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Since bug https://bugs.passt.top/show_bug.cgi?id=74 is now fixed in passt, it now became possible to test with small socket buffers, doing so revealed some bugs and a performance issue on the libkrun side.
If you want to test this, please use passt 0^20231004.gf851084, because of the aforementioned bug.
Note that there is now a performance issue where increasing the socket buffer sizes to the previously recommended 16Mib decreases performance. The performance of libkrun with small socket buffers is better than QEMU+passt, with bigger buffer sizes they are both kind of slow. Curiously limiting iperf3 speed (using -b) increases the performance. This seems to be another passt issue.