netdev - Re: NAPI poll behavior in various Intel drivers

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:	Sat, 05 Jan 2008 20:15:49 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	jchapman@...alix.com, netdev@...r.kernel.org,
	auke-jan.h.kok@...el.com
Subject: Re: NAPI poll behavior in various Intel drivers

From: Andi Kleen <andi@...stfloor.org>
Date: Sat, 05 Jan 2008 14:29:05 +0100

> In 2.4 we used to have (haven't checked recently) performance regressions
> with NAPI vs non NAPI (or versus the old BCM vendor driver) on tg3 for
> some workloads that didn't fully fill the link. The theory was always
> that the reason for that was something like the regular switching in
> and out. So I think we saw that problem on tg3 too.

It was because we originally didn't program the HW interrupt
mitigation settings at all when using NAPI, now we do and the problem
is long gone.
--
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