As we can see here, packet length varies over what it should be, when
using realtek, packet length is strictly 1448, which fits uplink fine
and upload degration will not occur.
This is not a pmtu problem either, same thing happens when pmtu
discovery is disabled.
This also happens on Windows, so I'm thinking its not distribution
related.
Thanks for any assistance
Hi, It seems I have classical "oh, okay nevermind"-scenario here, had
more time to look into it and it seems
I was too eager to jump on conclusions with strictly mtu-related issue,
ignoring the fact I was merely witnessing gso/tso in operation without
fully realizing that offloading can actually sink so deeply under
virtualization layer and actually function (properly).
Performance degradation seems to come from other layers than kvm/qemu
itself, I was able to benchmark speeds up to 3Gbps from virtual guest to
host server using virtio.
I can't explain why realtek just works at this point, maybe due it's
lacking some feature that is partly to blame here, have to dig deeper.
(:
Thanks and sorry for mailing list noise(:
Markus Kovero
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