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Re: [Xen-devel] TSQ accounting skb->truesize degrades throughput for large packets



On 06/09/13 13:57, Eric Dumazet wrote:
Well, I have no problem to get line rate on 20Gb with a single flow, so
other drivers have no problem.
I've made some tests on bare metal:
Dell PE R815, Intel 82599EB 10Gb, 3.11-rc4 32 bit kernel with 3.17.3 ixgbe (TSO, GSO on), iperf 2.0.5 Transmitting packets toward the remote end (so running iperf -c on this host) can make 8.3 Gbps with the default 128k tcp_limit_output_bytes. When I increased this to 131.506 (128k + 434 bytes) suddenly it jumped to 9.4 Gbps. Iperf CPU usage also jumped a few percent from ~36 to ~40% (softint percentage in top also increased from ~3 to ~5%) So I guess it would be good to revisit the default value of this setting. What hw you used Eric for your 20Gb results?

Regards,

Zoli

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