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Re: [PATCH v2] net: macb: Increase DMA TX buffer size

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From: Xander Huff <xander.huff@ni.com>
Date: Wed, 24 Aug 2016 17:25:39 -0500

> From: Nathan Sullivan <nathan.sullivan@ni.com>
> 
> In recent testing with the RT patchset, we have seen cases where the
> transmit ring can fill even with up to 200 txbds in the ring. Increase the
> size of the DMA TX ring to avoid overruns.
> 
> Signed-off-by: Xander Huff <xander.huff@ni.com>
> Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>

This is really a short term solution.

While a larger TX ring may help RT, it's wasteful to have a ring that
large on non-RT.  Both uses are valid.

Therefore what really needs to happen is to make this driver support
changing the RX and TX ring sizes at runtime via ethtool just like
pretty much every other driver.

THanks.

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[PATCH] net: macb: Increase DMA buffer size Xander Huff <xander.huff@ni.com> - 2016-08-24 21:00 +0200
  Re: [PATCH] net: macb: Increase DMA buffer size Nicolas Ferre <nicolas.ferre@atmel.com> - 2016-08-24 21:20 +0200
    [PATCH v2] net: macb: Increase DMA TX buffer size Xander Huff <xander.huff@ni.com> - 2016-08-25 01:30 +0200
      Re: [PATCH v2] net: macb: Increase DMA TX buffer size David Miller <davem@redhat.com> - 2016-08-26 02:20 +0200

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