linux-kernel - Re: [PATCH for-next v9 0/5] On-Demand Paging on SoftRoCE

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Message-ID: <CAHjRaAfuTDGP9TKqBWVDE32t0JzE3jpL8WPBpO_iMhrgMS6MFQ@mail.gmail.com>
Date: Fri, 3 Jan 2025 18:40:48 +0100
From: Joe Klein <joe.klein812@...il.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: "Daisuke Matsuda (Fujitsu)" <matsuda-daisuke@...itsu.com>, 
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>, "leon@...nel.org" <leon@...nel.org>, 
	"zyjzyj2000@...il.com" <zyjzyj2000@...il.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"rpearsonhpe@...il.com" <rpearsonhpe@...il.com>, "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
Subject: Re: [PATCH for-next v9 0/5] On-Demand Paging on SoftRoCE

On Fri, Jan 3, 2025 at 4:05 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Dec 24, 2024 at 08:52:24AM +0000, Daisuke Matsuda (Fujitsu) wrote:
> > On Mon, Dec 23, 2024 10:55 AM Daisuke Matsuda (Fujitsu) <matsuda-daisuke@...itsu.com> wrote:
> > > On Mon, Dec 23, 2024 2:25 AM Joe Klein <joe.klein812@...il.com> wrote:
> > > > We have tested this patcheset and had a lot of problems, even without using the ODP option in softroce. I don't know if
> > > others have done similar tests. If we have to merge this patchset into upstream, is it > possible to add a kernel option to
> > > enable/disable this patchset?
> > >
> > > Hi Joe,
> > >
> > > Can you clarify the test and the problems you observed?
> > > I wonder if you tried the test with the latest tree WITHOUT my patches.
> > >
> > > As far as I know, there is something wrong with the upstream right now.
> > > It does not complete the rdma-core testcases, and 'segmentation fault' is observed
> > > in the middle of the full test run, which did not happen before October 2024.
> >
> > It appears that the root cause of this issue lies within the userspace components.
> > My report yesterday was based on experiments conducted on Ubuntu 24.04.1 LTS (x86_64).
> > It seems to me that rxe is somehow broken regardless of kernel version
> > as long as userspace components are provided by Ubuntu 24.04.1 LTS.
> > I built and tried linux-6.11, linux-6.10, and linux-6.8, and they all failed as I reported.
> >
> > I switched to Ubuntu 22.04.5 LTS (aarch64) to test with the older libraries.
> > All tests available passed using the rdma for-next tree without any problem.
> > Then, I applied my ODP patches onto it, and everything is still fine.
> > ####################
> > ubuntu@...a-aarch64:~/rdma-core$ git branch -v
> > * master fb965e2d0 Merge pull request #1531 from selvintxavier/pbuf_optimization
> > ubuntu@...a-aarch64:~/rdma-core$ ./build/bin/run_tests.py
> > ..........ss..........ssssssssss..............ssssssssssssssssssssssssss.sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss........ssssss..ss....s.sssssss....ss....ss..............s......................ss.............sss...ssss
> > ----------------------------------------------------------------------
> > Ran 321 tests in 3.599s
> >
> > OK (skipped=211)
> > ubuntu@...a-aarch64:~/rdma-core$ ./build/bin/run_tests.py -k odp
> > sssssssss..ss....s.s
> > ----------------------------------------------------------------------
> > Ran 20 tests in 0.269s
> >
> > OK (skipped=13)
> > ####################
> >
> > Possibly, there was a regression in libibverbs between v39.0-1 and v50.0-2build2.
> > We need to take a closer look to resolve the malfunction of rxe on Ubuntu 24.04.
>
> That's distressing.
>
> > In conclusion, I believe there is nothing in my ODP patches that could cause
> > the rxe driver to fail. I would appreciate any feedback on potential improvements.
>
> What am I supposed to do with this though?
>
> Joe, can you please answer Daisuke's questions on what problems you
> observed and if you observe them without the ODP patches?

Will make tests and let you know the result very soon.

>
> Jason