[Users] Performance degradation on 042stab113.X

[Narcis Garcia]

You could return to v108 and watch performance again.


El 29/03/16 a les 22:19, Karl Johnson ha escrit:
> Disks are fine and RAID is optimal. It doesn't happen only when backups
> run but it's easier to see during this time. What's strange is that
> there were no issue on <108 kernels.
> 
> It could have been this following patch from RedHat but 113 isn't based
> on 2.6.32-573.22.1, 114 will be I think.
> 
> /* Due to prematurely decremented calc_load_task, the calculated load
> average was off by up to the number of CPUs in the machine. (BZ#1300349)/
> 
> Karl
> 
> On Tue, Mar 29, 2016 at 3:35 PM, Gena Makhomed <gmm at csdoc.com
> <mailto:gmm at csdoc.com>> wrote:
> 
>     On 29.03.2016 21:03, Karl Johnson wrote:
> 
>         Every weekend I do backups of all CT which take a lot of IO. It
>         didn't
>         affect much load average before 108 but as soon as I upgraded to
>         113, load
>         got very high and nodes became sluggish during backups. It might be
>         something else but I was looking for feedback if someone else
>         had the same
>         issue. I will continue to troubleshoot this issue. Meanwhile, I will
>         upgrade them from 113.12 to 113.21 and see how it goes even if
>         there's
>         nothing related to this in the changelog.
> 
> 
>     See smartctl - temperature of HDDs and seek/read errors.
> 
>     Reason of "nodes became sluggish during backups"
>     can be high HDD temp and high seek/read errors rate.
> 
>     Also see free space on backup partition - if free space
>     low it will be very fragmented and write will be slow
>     - need many IOPS for write many small file chunks.
> 
>     -- 
>     Best regards,
>      Gena
> 
>     _______________________________________________
>     Users mailing list
>     Users at openvz.org <mailto:Users at openvz.org>
>     https://lists.openvz.org/mailman/listinfo/users
> 
> 
> 
> 
> _______________________________________________
> Users mailing list
> Users at openvz.org
> https://lists.openvz.org/mailman/listinfo/users
>