netdev - Re: [PATCH net-next] xen-netback: allocate xenvif arrays using vzalloc.

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Date:	Tue, 29 Oct 2013 08:43:50 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joby Poriyath <joby.poriyath@...rix.com>
Cc:	netdev@...r.kernel.org, wei.liu2@...rix.com,
	ian.campbell@...rix.com, xen-devel@...ts.xen.org,
	andrew.bennieston@...rix.com, david.vrabel@...rix.com,
	malcolm.crossley@...rix.com
Subject: Re: [PATCH net-next] xen-netback: allocate xenvif arrays using
 vzalloc.

On Tue, 2013-10-29 at 15:27 +0000, Joby Poriyath wrote:
> This will reduce memory pressure when allocating struct xenvif.
> 
> The size of xenvif struct has increased from 168 to 36632 bytes (on x86-32).
> See commit b3f980bd827e6e81a050c518d60ed7811a83061d. This resulted in
> occasional netdev allocation failure in dom0 with 752MiB RAM, due to
> fragmented memory.

This looks overkill. 

Replacing a single allocation of ~36 KB into 5 vmalloc() looks like you
did not really tried other things...

This should be done generically in alloc_netdev_mqs()

Take a look at commit 60877a32bce00041
("net: allow large number of tx queues")




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