[OpenAFS] OpenAFS client softlockup on concurrential file-system patterns (100% CPU in kernel mode)

Ciprian Dorin Craciun ciprian.craciun@gmail.com
Wed, 20 Nov 2019 21:47:39 +0200

On Wed, Nov 20, 2019 at 9:37 PM Ciprian Dorin Craciun
<ciprian.craciun@gmail.com> wrote:
> Now the client works OK, however if I start the `afsd` client on the
> server itself (i.e. over `loopback` network), where previously (with
> `-jumbo`) I was able to max-out the disks (~300 MiB/s), now seems to
> be capped at around ~120MiB.  (The packet-per-second is aroun
> ~120K...)

Minor correction (only to the item above, the rest still stands),
restarting the `afsd` cache on the server itself (thus over
`loopback`), I once again am able to max-out the disks (read only).
(For some reason this wasn't the case in the previous test...)  (It's
not the benchmark, as I read large ~20MiB files with 16 concurrent
readers, and the same command was used in both test-cases.)