linux-kernel - Re: [RFC PATCH V2 5/5] Add TX zero copy in macvtap

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Message-ID: <1291999088.2167.55.camel@localhost.localdomain>
Date:	Fri, 10 Dec 2010 08:38:08 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	mst@...hat.com, xiaohui.xin@...el.com, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V2 5/5] Add TX zero copy in macvtap

On Fri, 2010-12-10 at 08:25 -0800, Shirley Ma wrote:
> On Fri, 2010-12-10 at 11:27 +0100, Eric Dumazet wrote:
> > You could make one atomic_add() outside of the loop, and factorize
> > many
> > things...
> > 
> > atomic_add(len, &skb->sk->sk_wmem_alloc);
> > skb->data_len += len;
> > skb->len += len;
> > skb->truesize += len;
> > while (len) {
> >         ...
> > } 
> 
> Yep, thanks, will update it! 

Maybe I should use total_len when skb frag mapping is done, something
like:

int total_len = 0;
...
total len += len;
...
skb->data_len += total_len;
skb->len += total_len;
skb->truesize += total_len;
atomic_add(total_len, &skb->sk->sk_wmem_alloc);

Shirley

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