Date: Thu, 08 Jan 2015 11:37:44 +0800 From: Julian Elischer <julian@freebsd.org> To: Gleb Smirnoff <glebius@FreeBSD.org>, "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: Craig Rodrigues <rodrigc@FreeBSD.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, Nikos Vassiliadis <nvass@gmx.com>, src-committers@freebsd.org Subject: Re: svn commit: r276747 - head/sys/netpfil/pf Message-ID: <54ADFB88.1090705@freebsd.org> In-Reply-To: <20150108003146.GL15484@FreeBSD.org> References: <201501060903.t06934qp081875@svn.freebsd.org> <20150107204631.GG15484@FreeBSD.org> <AEFC5AEF-7700-426A-96D3-A14BF68CA9BC@lists.zabbadoz.net> <20150108003146.GL15484@FreeBSD.org>
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On 1/8/15 8:31 AM, Gleb Smirnoff wrote: > On Thu, Jan 08, 2015 at 12:21:57AM +0000, Bjoern A. Zeeb wrote: > B> > B> > On 07 Jan 2015, at 20:46 , Gleb Smirnoff <glebius@freebsd.org> wrote: > B> > > B> > On Tue, Jan 06, 2015 at 09:03:04AM +0000, Craig Rodrigues wrote: > B> > C> Author: rodrigc > B> > C> Date: Tue Jan 6 09:03:03 2015 > B> > C> New Revision: 276747 > B> > C> URL: https://svnweb.freebsd.org/changeset/base/276747 > B> > C> > B> > C> Log: > B> > C> Instead of creating a purge thread for every vnet, create > B> > C> a single purge thread and clean up all vnets from this thread. > B> > C> > B> > C> PR: 194515 > B> > C> Differential Revision: D1315 > B> > C> Submitted by: Nikos Vassiliadis <nvass@gmx.com> > B> > > B> > I am not sure that this is a good idea. The core idea of VNETs > B> > is that they are isolated from each other. If we serialize purging, > B> > then vnets are strongly affecting each other. > B> > > B> > AFAIU, from the PR there is some panic fixed. What is the actual bug > B> > and why couldn't it be fixed with having per-vnet thread? > B> > B> You don’t 30000 whatever pf purging threads on a system all running, possibly competing for some resources, e.g., locks? > > Isn't a vnet, which is a jail, already a set of a dozen of processes? So, > if you are speaking of "30000 whatever pf purging threads", then you > already mean "1 mln whatever processes". Actually, no. as we have presetned it, a vnet is part of a jail. But, it was originally an independnent thing, like FIBS, and a jail may exist with a single process. I think one should be enough.. or if that it is not sufficient, then at maximum, one per cpu > > Speaking of pf purging threads competing for resources. If someone wants > really independent pfs in vnets, then locks should be virtualized as well. >
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