svn commit: r293721 - head/sys/dev/hyperv/netvsc

[Sepherosa Ziehau]

On Tue, Jan 12, 2016 at 12:42 PM, Gleb Smirnoff <glebius at freebsd.org> wrote:
> On Tue, Jan 12, 2016 at 01:50:56AM +0000, Sepherosa Ziehau wrote:
> S> Author: sephe
> S> Date: Tue Jan 12 01:50:56 2016
> S> New Revision: 293721
> S> URL: https://svnweb.freebsd.org/changeset/base/293721
> S>
> S> Log:
> S>   hyperv/hn: Avoid mbuf cluster allocation, if the packet is small.
> S>
> S>   This one mainly avoids mbuf cluster allocation for TCP ACKs during
> S>   TCP sending tests.  And it gives me ~200Mbps improvement (4.7Gbps
> S>   -> 4.9Gbps), when running iperf3 TCP sending test w/ 16 connections.
> S>
> S>   While I'm here, nuke the unnecessary zeroing out pkthdr.csum_flags.
> S>
> S>   Reviewed by:               adrain
> S>   Approved by:               adrian (mentor)
> S>   Sponsored by:              Microsoft OSTC
> S>   Differential Revision:     https://reviews.freebsd.org/D4853
>
> Consider using m_get2() instead of implementing it yourself :)

Good suggestion, noted :)

Thanks,
sephe

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