netdev - Re: [PATCH v6] net: batch skb dequeueing from softnet input_pkt

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]

Message-ID: <20100502071324.1a95fdad@infradead.org>
Date:	Sun, 2 May 2010 07:13:24 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, hadi@...erus.ca,
	xiaosuo@...il.com, therbert@...gle.com, shemminger@...tta.com,
	netdev@...r.kernel.org, lenb@...nel.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
 input_pkt_queue

> 
> Cn                Avg residency       P-states (frequencies)
> C0 (cpu running)        (68.9%)         2.93 Ghz    46.5%
> polling           0.0ms ( 0.0%)         2.80 Ghz     5.1%
> C1 mwait          0.0ms ( 0.0%)         2.53 Ghz     3.0%
> C2 mwait          0.0ms (31.1%)         2.13 Ghz     2.8%
>                                         1.60 Ghz    38.2%

I bet your system advertizes C2 with the same latency as C1,
but with lower power... which means Linux will pretty much never
pick C1.... no matter how much you take Andi's patch.

this is a bios thing... and until we put in the patch to override the
bios values (I can dust it off but it might need a bit of tweaking
since it was against .31) Andi's patch alone won't cut it... you also
need a non-lying bios ;)



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
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