netdev - Re: [PATCH net-next v2] net: bcmgenet: collect Rx discarded packet count

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Message-ID: <CAGXr9JHSGtySCs80PfSPBGbWyTXiE3pA0esi=fyCMPKRxmhboA@mail.gmail.com>
Date:	Wed, 11 Mar 2015 10:59:32 -0700
From:	Petri Gynther <pgynther@...gle.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jaedon Shin <jaedon.shin@...il.com>
Subject: Re: [PATCH net-next v2] net: bcmgenet: collect Rx discarded packet count

I find the Rx discard counter very useful, as it indicates HW dropped
packets, which directly affects media playback quality.

In our unit tests, we actually discovered a major interrupts-off
offender with this. Even with a moderate Rx traffic, we were seeing Rx
discards. It turned out that using a large dmesg log buffer and
dumping it with "cat /proc/kmsg" held interrupts off for long enough
that bcmgenet experienced discards. It was very useful to have the
discard data available when debugging this.
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