netdev - Re: [PATCH v4 06/10] e1000e: Support for byte queue limits

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Message-ID: <20111129130137.000009ce@unknown>
Date:	Tue, 29 Nov 2011 13:01:37 -0800
From:	Jesse Brandeburg <jesse.brandeburg@...el.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 06/10] e1000e: Support for byte queue limits

On Mon, 28 Nov 2011 18:33:16 -0800
Tom Herbert <therbert@...gle.com> wrote:

> Changes to e1000e to use byte queue limits.

First:  thanks Tom for looking into e1000e with this work.

> @@ -1096,6 +1097,10 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter)
>  			if (cleaned) {
>  				total_tx_packets += buffer_info->segs;
>  				total_tx_bytes += buffer_info->bytecount;
> +				if (buffer_info->skb) {
> +					bytes_compl += buffer_info->skb->len;

whats wrong with using total_tx_bytes or buffer_info->bytecount?  it
contains the "bytes on the wire" value which will be slightly larger
than skb->len, but avoids warming the skb->len cacheline unnecessarily.

the rest of the patch to e1000e looks okay.
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