It would be nice if there was a mount option to have such parameters adjusted that only influence CephFS Kernel Client. Jeff Layton <jlayton@xxxxxxxxxx> 于2020年11月12日周四 下午11:59写道： > > On Thu, 2020-11-12 at 23:17 +0800, Sage Meng wrote: > > Hi All, > > > > Cephfs kernel client is influenced by kernel page cache when we > > write data to it, outgoing data will be huge when os starts to flush > > page cache. So Is there a way to make Cephfs kernel client to send > > data to ceph cluster smoothly when buffer io is used ? Better a way > > that only influence Ceph IO not the whole system IO. > > Not really. > > The ceph client just does what the VM subsys asks it to do. If the VM > says "write out these pages", then it'll do it -- otherwise they'll just > sit there dirty. > > Usually you need to tune things like the dirty_ratio and > dirty_background_ratio to smooth this sort of thing out, but those are > system-wide knobs. > > Another alternative is to strategically fsync or syncfs from time to > time, but that's sort of outside the scope of the kernel client. > -- > Jeff Layton <jlayton@xxxxxxxxxx> >
