Re: Possible bug report: kernel 6.5.0/6.5.1 high load when CIFS share is mounted (cifsd-cfid-laundromat in"D" state)

[Brian Pardy]

On Tue, Sep 19, 2023 at 1:36 AM Steve French <smfrench@xxxxxxxxx> wrote:
>
> Does the attached patch help in your case?  It avoids starting the
> laundromat thread for IPC shares (which cuts the number of the threads
> in half for many cases) and also avoids starting them if the server
> does not support directory leases (e.g. if Samba server instead of
> Windows server).

Hello,

I applied the 0001-smb3-do-not-start-laundromat-thread-when-dir-leases-.patch
you provided against the 6.5.3 kernel.

I can confirm that it resolves this issue - no laundromat threads are
created, and the reported load average is as expected, not falsely
high.

This appears to fully fix the issue in my case.  Thank you very much!

> On Mon, Sep 18, 2023 at 10:00 PM Steve French <smfrench@xxxxxxxxx> wrote:
> >
> > Paulo and I were discussing the laundromat thread at the SMB3.1.1 test
> > event (at SDC this week) which is now going on - will let you know
> > what we find.
> >
> > One obvious thing is that it probably isn't necessary for cases when
> > the server does not support directory leases, but we noticed another
> > problem as well.