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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Second regression due to libxl: Remove linux udev rules (2ba368d13893402b2f1fb3c283ddcc714659dd9b)
El 04/08/15 a les 10.32, Ian Campbell ha escrit: > On Tue, 2015-08-04 at 10:14 +0200, Roger Pau Monnà wrote: >> This was not a problem when using udev, because there's no timeout, but >> libxl has a hard timeout (10s) regarding hotplug script execution. The >> only way I see to solve this is to remove the checks done in the block >> hotplug script, or to increase the timeout (but since the execution >> time is not bounded this is doomed to fail if enough guests are using >> the same image). > > If we have evidence (as we appear to) that the timeout is not sufficient > for starting large numbers of guests in // then increasing the timeout > would seem reasonable. > > Perhaps someone could set an insane timeout and measure the maximum time > they see in practice in this test case. Then we could decide what a > reasonable timeout should be? Maybe we could even find a linear pattern in > the number of guests and use that to extrapolate a reasonable timeout? I've created 40 HVM guest in parallel, all of them using the same file as CD-ROM image. The highest block hotplug execution time I've measured is 23s, so IMHO setting the timeout to 40s (or maybe 60s to really be on the safe side?) seems reasonable. I will send a patch to do that ASAP. Doing it based on the number of guests is not completely right, ideally we should do it based on the number of guests using the same image file. Here is the trace of execution times: Time to execute: 0.00 Time to execute: 0.00 Time to execute: 0.00 Time to execute: 1.00 Time to execute: 0.00 Time to execute: 0.00 Time to execute: 1.00 Time to execute: 2.00 Time to execute: 1.00 Time to execute: 2.00 Time to execute: 2.00 Time to execute: 3.00 Time to execute: 4.00 Time to execute: 5.00 Time to execute: 7.00 Time to execute: 7.00 Time to execute: 9.00 Time to execute: 11.00 Time to execute: 13.00 Time to execute: 14.00 Time to execute: 16.00 Time to execute: 16.00 Time to execute: 12.00 Time to execute: 12.00 Time to execute: 11.00 Time to execute: 12.00 Time to execute: 12.00 Time to execute: 12.00 Time to execute: 14.00 Time to execute: 15.00 Time to execute: 15.00 Time to execute: 14.00 Time to execute: 19.00 Time to execute: 20.00 Time to execute: 19.00 Time to execute: 19.00 Time to execute: 21.00 Time to execute: 23.00 Time to execute: 21.00 Time to execute: 23.00 Roger. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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