James Dickens wrote: >>> kugutsum >>> >>> I tried with just 4Gb in the system, and the same >> issue. I'll try >>> 2Gb tomorrow and see if any better. (ps, how did >> you determine >>> that was the problem in your case) >> >> sorry, I wasn't monitoring this list for a while. My >> machine has 8GB >> of ram and I remembered that some drivers had issues >> doing DMA access >> over the 4GB limit. Someone noted that even if you >> have exactly 4GB >> you will still run into this issue because a lot of >> address spaces in >> already mapped or reserved by Xen. >> >> Mark Johnson said that the xen team should try to do >> a better job >> allocating low memory. >> >> What you should do is set the dom0_mem to 1 or 2 gig >> and you can still >> use the rest of the memory in your domU. >> >> Mark Johnson suggested to limit >> the amount of memory zfs uses. e.g. set the following >> in /etc/system. >> >> set zfs:zfs_arc_max = 0x10000000 >> > > has anyone tried boosting this number, 256MB seems pretty low perhaps someone > has tested with 512 or 768MB since someone mentions having tried with 1GB and > it didn't work. Machine feels sluggish with this setting. Has anyone tested > the 1 or 2GB Domain-0 limit, was it better than the zfs_arc fix? I am hoping > to use my machine as a xVM/ZFS server. > > Is this being tracked by a bug report so we can get more information as to > what is the root cause and when this is fixed so we can remove the work > around from our systems. > > If an engineers help debugging this I'm handy with dtrace and the machine is > not in use so I would be more than happy to investigate any ideas or fixes. > > James Dickens > uadmin.blogspot.com >
When I upgraded from 2 GB to 8GB, I found that my system became very sluggish when doing disk intensive jobs (such as building ON). Limiting Dom0 to 2 GB seems to have fixed that. Menno -- Menno Lageman - Sun Microsystems - http://blogs.sun.com/menno _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
