netdev - Re: [PATCH net-next 11/11] net/mlx4_en: Fix transmit timeout when driver restarts port

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Message-ID: <1359564612.2789.5.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Wed, 30 Jan 2013 16:50:12 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
	Eugenia Emantayev <eugenia@...lanox.com>
Subject: Re: [PATCH net-next 11/11] net/mlx4_en: Fix transmit timeout when
 driver restarts port

On Wed, 2013-01-30 at 12:34 +0200, Amir Vadai wrote:
> Under heavy CPU load, changing, ring size/mtu/etc. could result in transmit
> timeout, since stop-start port might take more than 10 seconds.
> Calling netif_detach_device to prevent tx queue transmit timeout.
[...]

It's actually worse than that - the watchdog can fire instantly if it
has been 10 seconds since the last packet was queued.

Anyway, this looks very much like a pending fix for the same issue in
sfc, so hopefully we both did it right. :-)

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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