Re: filecache LRU performance regression

[Chuck Lever III <chuck.lever@oracle.com>]

> On May 27, 2022, at 5:34 PM, Chuck Lever III <chuck.lever@oracle.com> wrote:
> 
> 
> 
>> On May 27, 2022, at 4:37 PM, Frank van der Linden <fllinden@amazon.com> wrote:
>> 
>> On Fri, May 27, 2022 at 06:59:47PM +0000, Chuck Lever III wrote:
>>> 
>>> 
>>> Hi Frank-
>>> 
>>> Bruce recently reminded me about this issue. Is there a bugzilla somewhere?
>>> Do you have a reproducer I can try?
>> 
>> Hi Chuck,
>> 
>> The easiest way to reproduce the issue is to run generic/531 over an
>> NFSv4 mount, using a system with a larger number of CPUs on the client
>> side (or just scaling the test up manually - it has a calculation based
>> on the number of CPUs).
>> 
>> The test will take a long time to finish. I initially described the
>> details here:
>> 
>> https://lore.kernel.org/linux-nfs/20200608192122.GA19171@dev-dsk-fllinden-2c-c1893d73.us-west-2.amazon.com/
>> 
>> Since then, it was also reported here:
>> 
>> https://lore.kernel.org/all/20210531125948.2D37.409509F4@e16-tech.com/T/#m8c3e4173696e17a9d5903d2a619550f352314d20
> 
> Thanks for the summary. So, there isn't a bugzilla tracking this
> issue? If not, please create one here:
> 
>  https://bugzilla.linux-nfs.org/
> 
> Then we don't have to keep asking for a repeat summary ;-)

I can easily reproduce this scenario in my lab. I've opened:

  https://bugzilla.linux-nfs.org/show_bug.cgi?id=386


--
Chuck Lever