Re[2]: [zfs-discuss] Re: Re: ZFS forces system to paging to the point it is
Hello Philippe, It was recommended to lower ncsize and I did (to default ~128K). So far it works ok for last days and staying at about 1GB free ram (fluctuating between 900MB-1,4GB). Do you think it's a long term solution or with more load and more data the problem can surface again even with current ncsize value? -- Best regards, Robertmailto:[EMAIL PROTECTED] http://milek.blogspot.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: Re: ZFS forces system to paging to the point it is
Robert Milkowski wrote: Hello Philippe, It was recommended to lower ncsize and I did (to default ~128K). So far it works ok for last days and staying at about 1GB free ram (fluctuating between 900MB-1,4GB). Do you think it's a long term solution or with more load and more data the problem can surface again even with current ncsize value? Robert, I don't think this should be impacted too much by load/data, as long as the DNLC is able to evict, you should be in good shape. We are still working on a fix for the root cause of this issue however. -Mark ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re[2]: [zfs-discuss] Re: Re: ZFS forces system to paging to the point it is
Hello Mark, Thursday, September 7, 2006, 12:32:32 AM, you wrote: MM Robert Milkowski wrote: On Wed, 6 Sep 2006, Mark Maybee wrote: Robert Milkowski wrote: ::dnlc!wc 1048545 3145811 76522461 Well, that explains half your problem... and maybe all of it: After I reduced vdev prefetch from 64K to 8K for last few hours system is working properly without workaround and free memory stays at about 1GB. Reducing vdev prefetch to 8K alse reduced read thruoutput 10x. I belive this is somehow related - maybe vdev cache was so aggressive (I got 40-100MB/s of reads) and consuming memory so fast that thread which is supposed to regain some memory couldn't keep up? MM I suppose, although the data volume doesn't seem that high... maybe you MM are just operating at the hairy edge here. Anyway, I have filed a bug MM to track this issue: MM 6467963 do_dnlc_reduce_cache() can be blocked by ZFS_OBJ_HOLD_ENTER() Well, it was working so far and then in less than 5 minutes free memory went to 0 and system was unresponsive I couldn't log in. So I guess exporting/importing pool and in addition lowering vdev prefetch to 8K is needed here. Hope it will stay longer that way. :( -- Best regards, Robertmailto:[EMAIL PROTECTED] http://milek.blogspot.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Re: Re: ZFS forces system to paging to the point it is
::dnlc!wc 1048545 3145811 76522461 This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: Re: ZFS forces system to paging to the point it is
Robert Milkowski wrote: On Wed, 6 Sep 2006, Mark Maybee wrote: Robert Milkowski wrote: ::dnlc!wc 1048545 3145811 76522461 Well, that explains half your problem... and maybe all of it: After I reduced vdev prefetch from 64K to 8K for last few hours system is working properly without workaround and free memory stays at about 1GB. Reducing vdev prefetch to 8K alse reduced read thruoutput 10x. I belive this is somehow related - maybe vdev cache was so aggressive (I got 40-100MB/s of reads) and consuming memory so fast that thread which is supposed to regain some memory couldn't keep up? I suppose, although the data volume doesn't seem that high... maybe you are just operating at the hairy edge here. Anyway, I have filed a bug to track this issue: 6467963 do_dnlc_reduce_cache() can be blocked by ZFS_OBJ_HOLD_ENTER() -Mark ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
