From owner-freebsd-current Fri Mar 7 11: 3:54 2003 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1B89E37B401 for ; Fri, 7 Mar 2003 11:03:53 -0800 (PST) Received: from bluejay.mail.pas.earthlink.net (bluejay.mail.pas.earthlink.net [207.217.120.218]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0706243F75 for ; Fri, 7 Mar 2003 11:03:52 -0800 (PST) (envelope-from tlambert2@mindspring.com) Received: from dialup-209.244.106.70.dial1.sanjose1.level3.net ([209.244.106.70] helo=mindspring.com) by bluejay.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128) (Exim 3.33 #1) id 18rN8A-0004h2-00; Fri, 07 Mar 2003 11:03:43 -0800 Message-ID: <3E68ECBF.E7648DE8@mindspring.com> Date: Fri, 07 Mar 2003 11:02:23 -0800 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Petri Helenius Cc: Bosko Milekic , freebsd-current@FreeBSD.ORG Subject: Re: mbuf cache References: <0ded01c2e295$cbef0940$932a40c1@PHE> <20030304164449.A10136@unixdaemons.com> <0e1b01c2e29c$d1fefdc0$932a40c1@PHE> <20030304173809.A10373@unixdaemons.com> <0e2b01c2e2a3$96fd3b40$932a40c1@PHE> <20030304182133.A10561@unixdaemons.com> <0e3701c2e2a7$aaa2b180$932a40c1@PHE> <20030304190851.A10853@unixdaemons.com> <001201c2e2ee$54eedfb0$932a40c1@PHE> <20030307093736.A18611@unixdaemons.com> <008101c2e4ba$53d875a0$932a40c1@PHE> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a49dbbb1f2649ef51ef0124081488e72aa2601a10902912494350badd9bab72f9c350badd9bab72f9c Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Petri Helenius wrote: > > There's probably a tightloop of frees going on somewhere. It's tough > > for me to analyze this as I cannot reproduce it. Have you tried > > running your tests over loopback to see if the same thing happens? > > What is the definition of "tightloop"? The received packet mbufs are freed > when the packets get processed/discarded which happens once for > a packet. The received packet rate is 50000-150000 packets per second. > > > > If so, and it does, can you please explain how to exactly replicate > > the test? > > Mirror a port with ~300-800Mbps of IP traffic to an em port. Just enable > promisc and monitor so it drops the packets after interrupt processing. > The overhead beyond that is neglible compared to mb_free. Ah. You are receiver livelocked. Try enabling polling; it will help up to the first stall barrier (NETISR not getting a chance to run protocol processing to completion because of interrupt overhead); there are two other stall barriers after that, and another in user space is possible depending on whether the application layer is request/response. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message