netdev - Re: Receive side performance issue with multi-10-GigE and NUMA

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Date:	Wed, 12 Aug 2009 16:29:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	billfink@...dspring.com
Cc:	netdev@...r.kernel.org, brice@...i.com, gallatin@...i.com
Subject: Re: Receive side performance issue with multi-10-GigE and NUMA

From: Bill Fink <billfink@...dspring.com>
Date: Fri, 7 Aug 2009 17:06:00 -0400

> To kludge around this, I made a different patch to the myri10ge driver.
> This time I hardcoded the NUMA node in the call to alloc_pages_node()
> to 2 for devices with an IRQ between 113 and 118 (eth2 through eth7)
> and to 0 for devices with an IRQ between 119 and 124 (eth8 through eth13).
> This is of course very specific to our specific system (NUMA node ids
> and Myricom 10-GigE device IRQs), and is not something that would be
> generically applicable.  But it was useful as a test, and it did
> improve the receive side performance substantially!

This, unfortunately, won't be comprehensive.  You'd also need to
kludge the NUMA node used for allocation of the skb->data buffer via
the netdev_alloc_skb() calls in myri10ge_rx_done() and friends.

This could possibly account for why, with your kludge, you still
were only getting 56.4703 Gbps
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