netdev - Re: tx queue hashing hot-spots and poor performance (multiq, ixgbe)

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Message-ID: <606676310904300704p5308e3b6le2c469d320cc669@mail.gmail.com>
Date:	Thu, 30 Apr 2009 07:04:33 -0700
From:	Andrew Dickinson <andrew@...dna.net>
To:	David Miller <davem@...emloft.net>
Cc:	jelaas@...il.com, netdev@...r.kernel.org
Subject: Re: tx queue hashing hot-spots and poor performance (multiq, ixgbe)

<snip>

> If all the TX activity is happening on one TX queue then
> there is a bug somewhere.
>
> Either the receiving device isn't invoking skb_record_rx_queue()
> correctly, or there is some bug in how we compute the TX hash.

 I'll do some debugging around skb_tx_hash() and see if I can make
sense of it.  I'll let you know what I find.  My hypothesis is that
skb_record_rx_queue() isn't being called, but I should dig into it
before I start making claims. ;-P

<snip>
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