Hello,
On 09/05/2016 04:34 PM, Konstantin Belousov wrote:
On Mon, Sep 05, 2016 at 02:26:30PM -0600, Alan Somers wrote:
Just to get your webserver out of the picture, could you please try
running the aio test suite on an NFS share? Do it like this:
$ cd /usr/tests/sys/aio
$ export TMPFS=/path/to/some/nfs/share
$ kyua test
By default, unsafe aio is disabled, i.e. aio where the operation is not
really async and can usurp kernel thread for indefinite amount of time.
Non-local filesystems accesses are classified as unsafe, since their
completion is controlled by remote host.
Setting vfs.aio.enable_unsafe to 1 solved the problem, though I don't
recall this being necessary in the past.
Thanks for the quick responses and fix.
-Alan
On Mon, Sep 5, 2016 at 2:14 PM, Jim Ohlstein <j...@ohlste.in> wrote:
Hello,
For sometime now we've used a backend (non-internet accessible) server to
generate static content that is shared via NFS to a front-end server for
internet access. Both machines use ZFS exclusively.
The webserver is nginx and we had AIO set to on, with the AIO module built
into the kernel.In 10.x it "just worked".
About two weeks ago I upgraded that backend machine to 11-STABLE in order to
start building packages for 11. I've just updated it again to r305417. I
don't recall it not working as expected.
More recently I upgraded the front-end machine to 11-STABLE @r305311. Since
then, AIO is not working and I get a critical error in the nginx logs like
this:
2016/09/05 15:58:02 [crit] 21145#0: *649 aio_read("/path/to/file") failed
(45: Operation not supported) while sending response to client ...
In 11 AIO is built into the kernel by default, and I have confirmed that it
works as expected in files from a local file system. Since the webserver
isn't aware that the file system in question is shared via NFS, it seems
this is an operating system issue.
--
Jim Ohlstein
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