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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html