Date: Fri, 5 Oct 2007 12:15:51 +0200 From: "Claus Guttesen" <kometen@gmail.com> To: "Pawel Jakub Dawidek" <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: ZFS kmem_map too small. Message-ID: <b41c75520710050315h34f5f30awc3da2d201426742@mail.gmail.com> In-Reply-To: <20071005000046.GC92272@garage.freebsd.pl> References: <20071005000046.GC92272@garage.freebsd.pl>
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> We'are about to branch RELENG_7 and I'd like to start discussion with > folks that experience 'kmem_map too small' panic with the latest HEAD. > > I'm trying hard to reproduce it and I can't, so I need to gather more > info how you are able to provoke this panic. > > What I did was to rsync 200 FreeBSD src trees from one directory to > another on the same ZFS file system. It worked fine. I have a server which gets these 'kmem_map too small' stops. I have an Dell PE2850 and is running current as of Sept. 26'th 2007. The error is easy to trigger. I have copied 90 GB of jpeg-files with a size of approx. 1 MB and a thumbnail at 4 KB. These files are distributed in approx. 700 folders. The files resides on it's own partition. It crashed while I copied the files down to the server and the server crashed copying the files on to another partiton on the same server. Everytime it crashed with a 'kmem_map too small' it seemed to want slightly more than was set aside in vm.kmem_size. So I adjusted it upwards from 512M, 640M and finally 768M. vm.kmem_size_max was set at 512M, 640M and finally 1024M (1 GB). It crashed with alot of file i/o. When I stopped copying files the server has been stable. It did *not* occur with a kernel build at May 25'th 2007. So now I will either downgrade or move the zfs-partitions to (open)solaris. We are getting closer to our xmas-season and I need to have a rock-solid zfs-server. -- regards Claus When lenity and cruelty play for a kingdom, the gentlest gamester is the soonest winner. Shakespeare
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