On 4/10/20 3:13 AM, Jesper Krogh wrote: > Hi. What is the suggested change? - is it Ceph that has an rsize,wsize > of 64MB ? > Sorry, set rsize and wsize in the mount options for your cephfs to something smaller. My problem with this is that I use autofs to mount my filesystem. Starting with 4.14.82, after a few mount/unmount cycles, the mount would fail with order 4 allocation error, and I'd have to reboot. I traced it to a change that doubled CEPH_MSG_MAX_DATA_LEN from 16M to 32M. Later in the 5 series kernels, this was doubled again, and that caused an order 5 allocation failure. This define is used to set the max and default rsize and wsize. Reducing the rsize and wsize in the mount option fixed the problem for me. This may do nothing for you, but, if it clears your allocation issue... > On Fri, Apr 10, 2020 at 12:47 AM Tony Lill <ajlill@xxxxxxxxxxxxxxxxxxx> wrote: >> >> >> >> On 4/9/20 12:30 PM, Jeff Layton wrote: >>> On Thu, 2020-04-09 at 18:00 +0200, Jesper Krogh wrote: >>>> Thanks Jeff - I'll try that. >>>> >>>> I would just add to the case that this is a problem we have had on a >>>> physical machine - but too many "other" workloads at the same time - >>>> so we isolated it off to a VM - assuming that it was the mixed >>>> workload situation that did cause us issues. I cannot be sure that it >>>> is "excactly" the same problem we're seeing but symptoms are >>>> identical. >>>> >>> >>> Do you see the "page allocation failure" warnings on bare metal hosts >>> too? If so, then maybe we're dealing with a problem that isn't >>> virtio_net specific. In any case, let's get some folks more familiar >>> with that area involved first and take it from there. >>> >>> Feel free to cc me on the bug report too. >>> >>> Thanks, >>> >> >> In 5.4.20, the default rsize and wsize is 64M. This has caused me page >> allocation failures in a different context. Try setting it to something >> sensible. >> -- >> Tony Lill, OCT, ajlill@xxxxxxxxxxxxxxxxxxx >> President, A. J. Lill Consultants (519) 650 0660 >> 539 Grand Valley Dr., Cambridge, Ont. N3H 2S2 (519) 241 2461 >> -------------- http://www.ajlc.waterloo.on.ca/ --------------- >> >> >> -- Tony Lill, OCT, ajlill@xxxxxxxxxxxxxxxxxxx President, A. J. Lill Consultants (519) 650 0660 539 Grand Valley Dr., Cambridge, Ont. N3H 2S2 (519) 241 2461 -------------- http://www.ajlc.waterloo.on.ca/ ---------------
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