Re: [PATCH 2.6] ixgb: fix ixgb_intr looping checks

[Andrew Morton <akpm@xxxxxxxx>]

Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx> wrote:
>
> This patch undoes a change that we believe will impact performance adversely,
> by creating possibly too long a delay between servicing completions.

Maybe.  But now take a look at how much additional pointless work will be
done in the common case.  For instance, every tx completion will incur a
call to ixgb_clean_rx_irq(), which then calls ixgb_alloc_rx_buffers().

There's quite a bit which can be optimised here.