netdev - Re: [PATCH] NET: Multiqueue network device support.

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:	Wed, 27 Jun 2007 20:15:47 -0400
From:	jamal <hadi@...erus.ca>
To:	David Miller <davem@...emloft.net>
Cc:	yi.zhu@...el.com, kaber@...sh.net, peter.p.waskiewicz.jr@...el.com,
	netdev@...r.kernel.org, jeff@...zik.org, auke-jan.h.kok@...el.com
Subject: Re: [PATCH] NET: Multiqueue network device support.

On Wed, 2007-27-06 at 15:54 -0700, David Miller wrote:

> The thing that's really important is that the value is not so
> large such that the TX ring can become empty.

In the case of batching, varying the values makes a difference.
The logic is that if you can tune it so that the driver takes
"sufficiently long" to stay closed the more packets you accumulate at
the qdisc and the more you can batch to the driver (when it opens up). 
Deciding what "sufficiently long" is an art - and i am sure speed
dependent. With e1000 at gige 128 seems to be a good value, going above
or below that gave lesser performance.

cheers,
jamal

-
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