netdev - Re: [PATCH net-next-2.6] net: speedup udp receive path

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: <o2u412e6f7f1005010324sfb63393fo86acdff4c97c5be3@mail.gmail.com>
Date:	Sat, 1 May 2010 18:24:00 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	hadi@...erus.ca, David Miller <davem@...emloft.net>,
	therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org,
	Eilon Greenstein <eilong@...adcom.com>,
	Brian Bloniarz <bmb@...enacr.com>
Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path

On Sat, May 1, 2010 at 2:14 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> BTW, using ee mask, cpu4 is not used at _all_, even for the user
> threads. Scheduler does a bad job IMHO.
>
> Using fe mask, I get all packets (sent at 733311pps by my pktgen
> machine), and my CPU0 even has idle time !!!
>
> Limit seems to be around 800.000 pps
>
> ------------------------------------------------------------------------------------------------------------------------
>   PerfTop:    5616 irqs/sec  kernel:93.9% [1000Hz cycles],  (all, 8 CPUs)
> ------------------------------------------------------------------------------------------------------------------------
>

Oh, cpu0 usage is about 100-(100-93.9)*8 = 51.2%(Am I right?). If we
can do weighted packet distributing: cpu0's weight is 1, and other
cpus are 2. maybe we can utilize all the cpu power.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
--
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