netdev - Re: TCP transmit performance regression

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] [day] [month] [year] [list]

Message-ID: <1341931558.3265.5399.camel@edumazet-glaptop>
Date:	Tue, 10 Jul 2012 16:45:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Network Development <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: TCP transmit performance regression

On Tue, 2012-07-10 at 22:22 +0800, Ming Lei wrote:

> Looks single page allocation won't put too much pressure on MM, that is
> why I suggested to avoid copy if the skb buffer size is less or equal one
> page. Anyway, unnecessary copy will increase computation and consume power.

AFAIK this long thread started with drivers/net/usb/smsc95xx.c using
32KB buffers, thats order-3 pages, not 'single page'

Definitely very wrong. You can try to claim the contrary, it wont be
wise.



--
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