em interface slow down on 8.0R

[Jack Vogel]

Well, what our testers do is assign BOTH an ipv4 and ipv6 address to an
interface,
then netperf runs over both, I don't know the internal details but I assume
both TCP
and UDP are going over ipv6.

Prior to your change there is IPv6 handling code in the tx checksum
routine,  so I
assume the hardware offload for that works. With your patch if I disable
TXCSUM
on the interface then it will work... but before your change it works with
that on.

So, am I missing something?

Cheers,

Jack


On Tue, Jan 26, 2010 at 12:12 PM, Pyun YongHyeon <pyunyh at gmail.com> wrote:

> On Tue, Jan 26, 2010 at 11:55:00AM -0800, Jack Vogel wrote:
> > I've tried this patch, and it completely breaks IPv6 offloads, which DO
> work
> > btw,
> > our testers have a netperf stress test that does both ipv4 and ipv6, and
> > that test
> > fails 100% after this change.
> >
> > I could go hacking at it myself but as its your code Pyun would you like
> to
> > resolve this issue?
> >
>
> I wonder how you could test IPv6 checksum offloading/TSO as FreeBSD
> does not have that capability yet. Do we already have that
> capability? I vaguely remember there was an effort to bring the
> support in but I don't know current status. If we have the
> capability I would have to update all other drivers that can do
> IPv6 checksum offloading/TSO for IPv6.
>
> > Regards,
> >
> > Jack
> >
> >
> > On Tue, Jan 26, 2010 at 9:40 AM, Jack Vogel <jfvogel at gmail.com> wrote:
> >
> > > No, it hasn't, I need time to look it over and be convinced of what he
> was
> > > doing.
> > >
> > > Jack
> > >
> > >
> > >
> > > On Tue, Jan 26, 2010 at 9:14 AM, Nick Rogers <ncrogers at gmail.com>
> wrote:
> > >
> > >> looks like the patch mentioned in kern/141843 has not been applied to
> the
> > >> tree?
> > >>
> > >> On Tue, Jan 26, 2010 at 9:00 AM, Nick Rogers <ncrogers at gmail.com>
> wrote:
> > >>
> > >> > Is it advisable to patch 8.0-RELEASE kernel sources with the latest
> > >> > (CURRENT) em driver (i.e., src/sys/dev/e1000)? It looks like there
> are
> > >> some
> > >> > updates to the driver since 8.0-RELEASE that may fix some problems?
> > >> >
> > >> >
> > >> _______________________________________________
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> > >>
> > >
> > >
>