[Differential] [Request, 6 lines] D4825: tcp/lro: Add network driver configurable LRO entry depth

[alex.burlyga.ietf alex.burlyga.ietf]

Perhaps Sephe planing to use it as a sysctl?

Alex.
On Jan 8, 2016 07:59, "Ravi Pokala" <rpokala at mac.com> wrote:

> -----Original Message-----
>
>
> >Date: Fri, 8 Jan 2016 02:29:22 +0000
> >From: "sepherosa_gmail.com (Sepherosa Ziehau)"
> >       <phabric-noreply at FreeBSD.org>
> >To: freebsd-net at freebsd.org
> >Subject: [Differential] [Request, 6 lines] D4825: tcp/lro: Add network
> >       driver configurable LRO entry depth
> >Message-ID:
> >       <differential-rev-PHID-DREV-ou2jiti5cx3pzqhm5pb2-req at FreeBSD.org>
> >Content-Type: text/plain; charset="utf-8"
> >
> >sepherosa_gmail.com created this revision.
> >sepherosa_gmail.com added reviewers: network, adrian, delphij,
> decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com, glebius.
> >sepherosa_gmail.com added a subscriber: freebsd-net-list.
> >Herald added a reviewer: transport.
> >
> >REVISION SUMMARY
> >  When there is only tiny amount of TCP connections and the host is slow,
> e.g. in VM, holding too much TCP segments in an LRO entry will cause RX
> performance degradation.  We now allow network drivers to configure how
> deep one LRO entry should be.
>
> Forgive me if I'm missing something obvious, but this patch doesn't
> actually change anything - rather than hard-coding 65535, you're using
> lc->lro_hiwat... which is hard-coded to 65535.
>
> Right?
>
> -Ravi (rpokala@)
>
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