Got you, thanks a lot Nick, i'll go with 4.0.6-wily Best regards!
*German* 2015-06-24 12:07 GMT-03:00 Nick Fisk <n...@fisk.me.uk>: > There isn’t really a best option at the moment, although if your IO sizes > aren’t that big, 4.0+ is probably the best option. > > > > *From:* German Anders [mailto:gand...@despegar.com] > *Sent:* 24 June 2015 16:02 > *To:* Nick Fisk > *Cc:* ceph-users > *Subject:* Re: [ceph-users] kernel 3.18 io bottlenecks? > > > > Thanks a lot Nick, ok i see, and is there any lower version that could be > used? Or is best to go with 4.0+ ? > > > *German* > > > > 2015-06-24 11:55 GMT-03:00 Nick Fisk <n...@fisk.me.uk>: > > That kernel probably has the bug where tcp_nodelay is not enabled. That is > fixed in Kernel 4.0+, however also in 4.0 blk-mq was introduced which > brings two other limitations:- > > > > 1. Max queue depth of 128 > > 2. IO’s sizes are restricted/split to 128kb > > > > *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf > Of *German Anders > *Sent:* 24 June 2015 15:45 > *To:* ceph-users > *Subject:* [ceph-users] kernel 3.18 io bottlenecks? > > > > Hi all, > > Is there any IO botleneck reported on kernel 3.18.3-031803-generic? > since I'm having a lot of iowait and the cluster is really getting slow, > and actually there's no much going on. I've read some time ago that there > were some issues with kern 3.18, so I would like to know what's the 'best' > kernel to go with, I'm using Ubuntu 14.04.1LTs and Ceph v0.82. > > Thanks a lot, > > Best regards, > > *German* > > > [image: Image removed by sender.] > > > >
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