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Re: [Xen-devel] [PATCH 0/6] xen: Support continuations from tasklets


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 6 Dec 2019 10:14:50 +0000
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Fri, 06 Dec 2019 10:15:03 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 06/12/2019 09:58, Jan Beulich wrote:
> On 05.12.2019 23:30, Andrew Cooper wrote:
>> From testing this series, I have re-confirmed the previous reported
>> observation that:
>>
>>   # while :; do xen-hptool smt-enable; xen-hptool smt-disable; done
>>
>> in dom0 eventually causes the serial console to cease working (wedge midway
>> through printing a line).
>>
>> There are sporadic "Broke affinity for IRQ26, new: ffff" messages, but the
>> serial always seems to break shortly after the first "Broke affinity for
>> IRQ30, new: ffff".  Both IRQs are non-descript PCI-MSI/-X interrupts bound to
>> dom0.
> And neither IRQ30 not IRQ26 are the serial ones? And serial does
> use an IRQ (i.e. isn't running in polling mode)? I'll see if I
> can repro (and then maybe be able to debug).

Serial uses IRQ0 and never has affinity changes as it is always bound to
CPU0.

Given our recent fun with the PEOI stack, that was going to be my next
port of call.  However everything else in the system looks to be working
fine, including the disks and network, suggesting that we aren't losing
other interrupts.

~Andrew

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