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Message-ID: <y2p412e6f7f1004211827x3e456588jb8e7ad780b891417@mail.gmail.com> Date: Thu, 22 Apr 2010 09:27:06 +0800 From: Changli Gao <xiaosuo@...il.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: hadi@...erus.ca, Rick Jones <rick.jones2@...com>, David Miller <davem@...emloft.net>, therbert@...gle.com, netdev@...r.kernel.org, robert@...julf.net, andi@...stfloor.org Subject: Re: rps perfomance WAS(Re: rps: question On Thu, Apr 22, 2010 at 3:01 AM, Eric Dumazet <eric.dumazet@...il.com> wrote: > > Thanks a lot Jamal, this is really useful > > Drawback of using a fixed src ip from your generator is that all flows > share the same struct dst entry on SUT. This might explain some glitches > you noticed (ip_route_input + ip_rcv at high level on slave/application > cpus) > Also note your test is one way. If some data was replied we would see > much use of the 'flows' > > I notice epoll_ctl() used a lot, are you re-arming epoll each time you > receive a datagram ? > > I see slave/application cpus hit _raw_spin_lock_irqsave() and > _raw_spin_unlock_irqrestore(). > > Maybe a ring buffer could help (instead of a double linked queue) for > backlog, or the double queue trick, if Changli wants to respin his > patch. > > OK, I'll post a new patch against the current tree, so Jamal can have a try. I am sorry, but I don't have a suitable computer for benchmark. -- 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
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