netdev - Re: [PATCH net-next-2.6] pktgen: speedup fragmented skbs

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Message-ID: <1295977653.3588.339.camel@edumazet-laptop>
Date:	Tue, 25 Jan 2011 18:47:33 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] pktgen: speedup fragmented skbs

Le mardi 25 janvier 2011 à 09:22 -0800, Ben Greear a écrit :
> On 01/25/2011 09:13 AM, Eric Dumazet wrote:
> > We spend lot of time clearing pages in pktgen.
> > (Or not clearing them on ipv6 and leaking kernel memory)
> >
> > Since we dont modify them, we can use one zeroed page, and get
> > references on it. This page can use NUMA affinity as well.
> >
> > Define pktgen_finalize_skb() helper, used both in ipv4 and ipv6
> 
> Some devices, like vlans, can change the skb, but perhaps they
> will not actually mess with the paged data?

Yes, its absolutely forbidden to write on paged data.

If necessary, a COW must be done.



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