Date: Fri, 21 Feb 2014 15:06:16 -0800 From: Craig Rodrigues <rodrigc@FreeBSD.org> To: attilio@freebsd.org Cc: FreeBSD Release Engineering Team <re@freebsd.org>, Xin Li <delphij@freebsd.org>, FreeBSD Security Team <secteam@freebsd.org>, Dmitry Sivachenko <trtrmitya@gmail.com>, Jung-uk Kim <jkim@freebsd.org>, "freebsd-java@freebsd.org" <freebsd-java@freebsd.org> Subject: Re: vm.pmap.pcid_enabled="0" seems to eliminate Java/Jenkins crashing problems in FBSD 10 Message-ID: <CAG=rPVds7Z6EvSFuDsB3pJ401DvSkps0gq0Zy=MS7_Wp29JddQ@mail.gmail.com> In-Reply-To: <CAJ-FndBKMg9NVm=qn2hmfEbFH-ZVPFr92gVHz3MkbgVXK=xpug@mail.gmail.com> References: <CAG=rPVeZGSs5_rRpRgdoSNK988TYY%2BBK76qeprWcR1JC64ekKQ@mail.gmail.com> <CAJ-FndBKMg9NVm=qn2hmfEbFH-ZVPFr92gVHz3MkbgVXK=xpug@mail.gmail.com>
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On Fri, Feb 21, 2014 at 2:54 PM, Attilio Rao <attilio@freebsd.org> wrote: > On Thu, Feb 20, 2014 at 5:45 AM, Craig Rodrigues <rodrigc@freebsd.org> > wrote: > > Hi, > > > > I am followed Jung-uk Kim's advice here: > > > > > http://lists.freebsd.org/pipermail/freebsd-java/2014-February/010582.html > > > > > > and configured the one of the FreeBSD stable/10 VM's (running at r261732) > > that I have running > > under BHyve with the > > following in /boot/loader.conf: > > > > vm.pmap.pcid_enabled="0" > > IIRC PCID had to be already disabled by default as we saw it was > slower in the real world or I'm missing something? > > Thanks, > Attilio > I never observed an problems with speed problems being introduced by vm.pmap.pcid_enabled="1". All I can say is that I saw that Java VM crash when vm.pmap.pcid_enabled="1", but setting vm.pmap.pcid_enabled="0" stopped the crashes with the Java VM. My focus was on stopping the Java crashes. I still don't know the real cause of the problem...is it: (1) problem with new code that is executed when vm.pmap.pcid_enabled="1" implementation? (2) latent bug in VM that is triggered by vm.pmap.pcid_enabled="1" but not directly related to that? (3) bug in OpenJDK? Hard to say for sure, but any help from a FreeBSD VM expert would be greatly appreciated. -- Craig
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