Date: Wed, 24 Nov 2010 13:42:53 -0800 From: "Li, Qing" <qing.li@bluecoat.com> To: "Jeremy Chadwick" <freebsd@jdc.parodius.com> Cc: Andrey Groshev <greenx@yartv.ru>, "Li, Qing" <qing.li@bluecoat.com>, freebsd-stable@freebsd.org Subject: RE: upd: 7.2->8.1 & many networks trouble & flowtable Message-ID: <B583FBF374231F4A89607B4D08578A43088D51F6@bcs-mail03.internal.cacheflow.com> In-Reply-To: <20101124171510.GA27702@icarus.home.lan> References: <201010230159.o9N1xGGF098363@lava.sentex.ca> <AANLkTimWTTHWC04my3CSoNGYsLarS9F10eoO=8Fz37cF@mail.gmail.com> <201010230821.o9N8LVuR001382@lava.sentex.ca> <20101023091555.W66242@maildrop.int.zabbadoz.net> <20101123175100.V24596@maildrop.int.zabbadoz.net> <AANLkTi=E89jJH68Ng1R06tKQi%2BxpaYORpktrZk5cvjVh@mail.gmail.com> <4CECDC89.7070706@yartv.ru> <A9DF1923-565F-4B43-8429-51C9D27FCC87@bluecoat.com> <4CECFF49.2010204@yartv.ru> <B583FBF374231F4A89607B4D08578A430823C9A4@bcs-mail03.internal.cacheflow.com> <20101124171510.GA27702@icarus.home.lan>
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<snip> >=20 > Here's an example of where disabling the flowtable solved a user's > problem in October 2010: >=20 > http://forums.freebsd.org/showthread.php?t=3D18301 >=20 <snip> > > Additionally I remember 2 or 3 posts to mailing lists here discussing > how bgpd was taking up 100% CPU (or specifically an entire CPU core). > I'm not sure what people did to solve that problem, but one has to > wonder if flowtable was the cause and they simply didn't realise it. > The context of the discussion was Andrey's original email, in which he reported multiple issues that include the em driver, routing daemons, flow-table garbage collector taking 100% CPU etc. The last issue obviously relates to the flow-table code, and I was not disputing about that. I simply asked for a clarification, which I did not receive a clear answer, on whether there are routing issues when flow-table is disabled. The reason why I asked, is because L2/L3 separation work (poorly named, of course) is more about the routing infrastructure changes in the FBSD 8.0 kernel, whereas the flow-table enhancements deal more with the connections (as detailed in my last email), and it builds on top of the L2/L3 work. <snip> >=20 > I can't speak for the OP or his situation -- flowtable appears to "work > fine for me", but then again none of our RELENG_8 systems do routing nor > handle large numbers of routes (very simple single-IP or multi-IP > systems on two networks). >=20 See above paragraph ... I am going to change the flow-table default setting to "disabled" for the=20 upcoming 8.2 release while these issues are being resolved, and the=20 documentation is being put in place.=20 =20 Sounds reasonable. -- Qing
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