On Fri, Jan 29, 2016 at 5:09 PM, Sage Weil <sweil@xxxxxxxxxx> wrote: > Hi Zheng, > > We have one feature already merged to ceph.git, CRUSH_TUNABLES5, that's a > pretty trivial change to crush/mapper.c that we can add to the kernel. > > But there are two more coming: > > OSDOPREPLY_ENCODING makes a small change to the OSDOpReply encoding for > performance reasons. Here is the PR > > https://github.com/ceph/ceph/pull/7386 > > The other is the file layout changes, which are much more invovled: > > https://github.com/ceph/ceph/pull/7098 > > Ideally we'd use the same feature bit for all of these, but it means they > all need to upstream into Linux together. Do you see a problem with that? > Assuming we get it all ready to go before the next merge window.. > > The tricky bit is we really need to know that we'll be able to do it > together before we cut jewel too and commit to the overlapping feature > bits. In the worst case, we could advertise support for the new bit for rbd and not for cephfs - I don't think we ever get/put ceph file layout from/to the wire in the rbd case. As for the two easy ones (TUNABLES5 in particular), I think we should try and get them in ASAP into 4.5 and then finalize the feature bit arrangement closer to the end of the cycle, if necessary. Otherwise we'll have jewel and no kernel supporting its default tunables. Thanks, Ilya -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
