Date: Wed, 10 Sep 2008 21:28:01 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Artem Belevich <fbsdlist@src.cx> Cc: freebsd-hackers@freebsd.org, Alan Cox <alc@cs.rice.edu> Subject: Re: Increasing KVM on amd64 Message-ID: <20080911042801.GA19245@icarus.home.lan> In-Reply-To: <ed91d4a80809101612t4e74a1e6y5ffffcf7ebf63d5d@mail.gmail.com> References: <ed91d4a80809101612t4e74a1e6y5ffffcf7ebf63d5d@mail.gmail.com>
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On Wed, Sep 10, 2008 at 04:12:25PM -0700, Artem Belevich wrote: > Alan, > > Thanks a lot for the patch. I've applied it to RELENG_7 and it seems > to work great - "make -j8 buildworld" succeeds, linux emulation seems > to work well enough to run linux-sun-jdk14 binaries, ZFS ARC size is > bigger, too. So far I didn't see any ZFS-related KVM shortages either. > > The only problem is that everything is fine as long as vm.kmem_size is > set to less or equal to 4096M. As soon as I set it to 4100M or > anything larger, kernel crashes on startup. I'm unable to capture > exact crash messages as they keep scrolling really fast on the screen > for a few seconds until the box reboots. Unfortunately the box does > not have built-in serial ports, so the messages are gone before I can > see them. :-( > > Is there a way to bump up KVM size even further - beyond 6GB? I've got > a box with 8GB or RAM and would like let ZFS ARC use most of it which > would require pretty large vm.kmem_max to fit it in. I was told fairly recently (a few days ago) that the 6GB limit was increased to 512GB on HEAD/CURRENT. The 6GB limit was during a "transitional" phase of addressing the problem. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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