netdev - Re: [PATCH net] xen-netback: fix abuse of napi budget

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Message-ID: <52A6ED35.7070003@citrix.com>
Date:	Tue, 10 Dec 2013 10:30:13 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Paul Durrant <paul.durrant@...rix.com>, <xen-devel@...ts.xen.org>,
	<netdev@...r.kernel.org>, Wei Liu <wei.liu2@...rix.com>
Subject: Re: [PATCH net] xen-netback: fix abuse of napi budget

On 10/12/13 10:25, Ian Campbell wrote:
> On Tue, 2013-12-10 at 10:16 +0000, Paul Durrant wrote:
>> netback seemed to be somewhat confused about the napi budget parameter and
>> basically ignored it. This patch fixes that, properly limiting the work done
>> in each poll.
> 
> What do you mean "ignored", xenvif_tx_submit seems to be tracking and
> testing work_done against the budget.

I have seen this warning in net_rx_action() trigger.

	WARN_ON_ONCE(work > weight);

Which means netback wasn't limiting the work done.

David
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