netdev - Re: [PATCH] vmxnet3: cap copy length at size of skb to prevent dropped frames on tx

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Date:	Sun, 19 Feb 2012 18:58:52 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sbhatewara@...are.com
Cc:	nhorman@...driver.com, mmatveev@...hat.com, pv-drivers@...are.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] vmxnet3: cap copy length at size of skb to prevent
 dropped frames on tx

From: Shreyas Bhatewara <sbhatewara@...are.com>
Date: Thu, 16 Feb 2012 12:07:02 -0800 (PST)

> 
>> Also, since I'm unable to do this, it wuold be great if vmware could
>> follow up
>> this patch with some additional code commentary as to why 54 bytes is
>> an optimal
>> pull length for a virtual NIC driver.  The comment that introduced
>> this was
>> vague on that.  Thanks!
> 
> 
> Neil, thanks for the patch. We fixed this bug in local repositories
> recently and I was about to post a patch to LKML. As for the explanation,
> the vNIC is optimized to work with most frequently occurring headers(TCP)
> and hence needs particular number of bytes in first sg. Even in case of
> UDP this pull is cheaper (CPU utilization wise) to do in guest than in
> device emulation.
> 
> Signed-off-by: Shreyas N Bhatewara <sbhatewara@...are.com>

Applied.
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