ixgbe input errors at high data rates

[Jack Vogel]

There is no user control,  on the TX side there is a check of the FLOWID of
the packet
which it gets on RX, if there is one it uses that to determine the right TX
queue to use.
The TX side also has a flow control but this only exists on the 82599, not
598.

The RX/TX queue pairs are bound to a cpu via their MSIX vector, so I believe
you will
see the results you wish.

As I implement more virtualization features more control may become
possible, we'll
see.

Regards,

Jack


2010/3/11 beezarliu <beezarliu at yahoo.com.cn>

>
> Speaking of multiqueue support in intel 10G, such as 82598,
> if we use RSS feature, can we select certain ip/port pair to open a tcp
> connection,
> so that the returning packet will come back from a pre-known
> receive queue?
>
>
> 2010-03-12
> ------------------------------
>  beezarliu
> ------------------------------
>  *发件人：* Jack Vogel
> *发送时间：* 2010-03-12  02:57:15
> *收件人：* rihad
> *抄送：* freebsd-net at freebsd.org
> *主题：* Re: ixgbe input errors at high data rates
>   I have typically not had the bandwidth to do performance work on the
> drivers, I am the
> only FreeBSD engineer in the wired network division here at Intel, however
> for 10G I
> have changed the rules and have been working to make the driver perform
> well.
>
> 10G is quite different from 1G, in order for it to work well its not just a
> matter of slapping
> in the hardware, the OS must be tuned, and the driver. Further, its an
> ongoing effort,
> so by recommending the CURRENT driver what I'm saying is that is my most
> recent
> code and thus, if all is well :), its also the best performing.
>
> The difference between things being tweaked vs not is quite dramatic,  like
> getting
>
> only 2 or 3 Gb versus getting 9.5 when properly set up. The multiqueue stack
> support
> in 8.0 is part of the equation, and in 7.X you wont have that.
>
> Hope this clarifies things some,
>
> Jack
>
>
> On Thu, Mar 11, 2010 at 10:39 AM, rihad  <rihad at mail.ru > wrote:
>
> > Jack Vogel wrote:
> >
> > > Similarly, I have done lots of work in two years to the ixgbe driver,
> > > I would even suggest that once you have 8 installed you get the driver
> > > from HEAD.
> > >
> >
> >  You mean the driver in 8.0 isn't good enough and I'd need to somehow mix
> > the driver from CURRENT with the rest of 8.0?
> >
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