[ofa-general] Re: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

[Krishna Kumar2]

[Removing Jeff as requested from thread :) ]

Hi Dave,

David Miller <davem at davemloft.net> wrote on 09/17/2007 07:55:02 AM:

> From: jamal <hadi at cyberus.ca>
> Date: Sun, 16 Sep 2007 22:14:21 -0400
>
> > I still think this work - despite my vested interest - needs more
> > scrutiny from a performance perspective.
>
> Absolutely.
>
> There are tertiary issues I'm personally interested in, for example
> how well this stuff works when we enable software GSO on a non-TSO
> capable card.
>
> In such a case the GSO segment should be split right before we hit the
> driver and then all the sub-segments of the original GSO frame batched
> in one shot down to the device driver.
>
> In this way you'll get a large chunk of the benefit of TSO without
> explicit hardware support for the feature.
>
> There are several cards (some even 10GB) that will benefit immensely
> from this.

I have tried this on ehca which does not support TSO. I added GSO flag at
the ipoib layer (and that resulted in a panic/fix that is mentioned in
this patchset). I will re-run tests for this and submit results.

Thanks,

- KK