netdev - Re: [PATCH V6 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb

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:	Thu, 26 May 2011 22:55:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	David Miller <davem@...emloft.net>, mst@...hat.com,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 2/4 net-next] skbuff: Add userspace zero-copy
 buffers in skb

Le jeudi 26 mai 2011 à 13:24 -0700, Shirley Ma a écrit :

> I could reduce callback pointer by moving it to *arg, but not desc, this
> indicates that which buffer DMA hasn't done yet in *arg.


I guess you dont need to use skb itself to hold all your states ?

I understand its convenient for you, but I believe its worth the pain to
use only one pointer to a (small) object where you put all your stuff.

Some machines alloc/free millions of skbs per second. 

If/when most skb uses are for userspace zero-copy buffers we can embbed
your small object in skb itself ;)


--
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