Hi David, Jan,
Terribly terribly sorry, I just noticed that the imaptest program used this 'DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA' to test with, which is 537 bytes. This explains at least why half the messages were so small. So conclusion is that. - either the hint is not correctly set to do the passive compression. - or the passive compression is not working when this hint is set. Thanks, Marc -----Original Message----- Cc: ceph-users Subject: Re: [ceph-users] ceph rbox test on passive compressed pool On 09/11 09:36, Marc Roos wrote: > > Hi David, > > Just to let you know, this hint is being set, what is the reason for > ceph of doing only half the objects? Can it be that there is some > issue with my osd's? Like some maybe have an old fs (still using disk > not volume)? Is this still to be expected or does ceph under pressure > drop compressing? > > https://github.com/ceph-dovecot/dovecot-ceph-plugin/blob/56d6c900cc9ec > 07dfb98ef2abac07aae466b7610/src/librmb/rados-storage-impl.cpp#L75 I was trying to look into this a bit :), can you give me more info about the OSDs that you are using? What filesystem are they on? Cheers! > > Thanks, > Marc > > > > -----Original Message----- > Cc: jan.radon > Subject: Re: [ceph-users] ceph rbox test on passive compressed pool > > The hints have to be given from the client side as far as I > understand, can you share the client code too? > > Also,not seems that there's no guarantees that it will actually do > anything (best effort I guess): > https://docs.ceph.com/docs/mimic/rados/api/librados/#c.rados_set_alloc > _hint > > Cheers > > > On 6 September 2020 15:59:01 BST, Marc Roos <m.r...@f1-outsourcing.eu> > wrote: > > > > I have been inserting 10790 exactly the same 64kb text message to a > > passive compressing enabled pool. I am still counting, but it looks > like > only half the objects are compressed. > > mail/b08c3218dbf1545ff430000052412a8e mtime 2020-09-06 > 16:27:39.000000, > size 63580 > mail/00f6043775f1545ff430000052412a8e mtime 2020-09-06 > 16:25:57.000000, > size 525 > mail/b875f40571f1545ff430000052412a8e mtime 2020-09-06 > 16:25:53.000000, > size 63580 > mail/e87c120b19f1545ff430000052412a8e mtime 2020-09-06 > 16:24:25.000000, > size 525 > > I am not sure if this should be expected from passive, these docs[1] > hint that passive 'compress if hinted COMPRESSIBLE'. From that I > would > conclude that all text messages should be compressed. > A previous test with a 64kb gzip attachment seemed to not compress, > > although I did not look at all object sizes. > > > > on 14.2.11 > > [1] > https://documentation.suse.com/ses/5.5/html/ses-all/ceph-pools.html > #sec-ceph-pool-compression > https://docs.ceph.com/docs/mimic/rados/operations/pools/ > ________________________________ > > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > > -- David Caro _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
