netdev - Re: [PATCH 10/13] bnx2x: Set default value of num

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Date:	Sun, 18 Apr 2010 23:29:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eilong@...adcom.com
Cc:	vladz@...adcom.com, netdev@...r.kernel.org, dmitry@...adcom.com
Subject: Re: [PATCH 10/13] bnx2x: Set default value of num_queues to 1 on
 32-bit platforms

From: "Eilon Greenstein" <eilong@...adcom.com>
Date: Mon, 19 Apr 2010 09:06:21 +0300

> Yes - running low on vmalloc is the reason. This patch does not restrict
> the usage of multi queue on 32bits - it is just changing the default
> queues values from the number of available CPUs to 1. If the user will
> use another value, it will work as before.

Changing the default to 1 is equivalent to disabling multi-queue.

> We encounter few issues were a 32bit kernel was installed on a
> multi-core platform and the driver allocated "too many" queues. One way
> to go is to limit the queue size and the other is the number of queues -
> leaving it as is caused issues due to running low on kernel virtual
> memory so a change was needed.

Look into using an allocation strategy other than vmalloc(), in fact
I can't see why you need to much memory that vmalloc() must be used
in the first place.
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