Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Andre Tomt
On 11.02.2020 17:36, Robin Murphy wrote: On 11/02/2020 4:03 pm, Chuck Lever wrote: Robin, your explanation makes sense to me. I can post a fix for this imbalance later today for Andre to try. FWIW here's a quick hack which *should* suppress the concatenation behaviour - if it makes Andre's sy

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Chuck Lever
> On Feb 11, 2020, at 11:36 AM, Robin Murphy wrote: > > On 11/02/2020 4:03 pm, Chuck Lever wrote: >>> On Feb 11, 2020, at 10:32 AM, Robin Murphy wrote: >>> >>> On 11/02/2020 3:24 pm, Chuck Lever wrote: > On Feb 11, 2020, at 10:12 AM, Robin Murphy wrote: > > On 11/02/2020 1:48 p

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Robin Murphy
On 11/02/2020 4:03 pm, Chuck Lever wrote: On Feb 11, 2020, at 10:32 AM, Robin Murphy wrote: On 11/02/2020 3:24 pm, Chuck Lever wrote: On Feb 11, 2020, at 10:12 AM, Robin Murphy wrote: On 11/02/2020 1:48 pm, Chuck Lever wrote: Andre- Thank you for the detailed report! Tom- There is a rich

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Chuck Lever
> On Feb 11, 2020, at 10:32 AM, Robin Murphy wrote: > > On 11/02/2020 3:24 pm, Chuck Lever wrote: >>> On Feb 11, 2020, at 10:12 AM, Robin Murphy wrote: >>> >>> On 11/02/2020 1:48 pm, Chuck Lever wrote: Andre- Thank you for the detailed report! Tom- There is a rich set of

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Robin Murphy
On 11/02/2020 3:24 pm, Chuck Lever wrote: On Feb 11, 2020, at 10:12 AM, Robin Murphy wrote: On 11/02/2020 1:48 pm, Chuck Lever wrote: Andre- Thank you for the detailed report! Tom- There is a rich set of trace points available in the RPC/RDMA implementation in 5.4/5.5, fwiw. Please keep me

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Chuck Lever
> On Feb 11, 2020, at 10:12 AM, Robin Murphy wrote: > > On 11/02/2020 1:48 pm, Chuck Lever wrote: >> Andre- >> Thank you for the detailed report! >> Tom- >> There is a rich set of trace points available in the RPC/RDMA implementation >> in 5.4/5.5, fwiw. >> Please keep me in the loop, let me

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Robin Murphy
On 11/02/2020 1:48 pm, Chuck Lever wrote: Andre- Thank you for the detailed report! Tom- There is a rich set of trace points available in the RPC/RDMA implementation in 5.4/5.5, fwiw. Please keep me in the loop, let me know if there is anything I can do to help. One aspect that may be worth

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-11 Thread Chuck Lever
Andre- Thank you for the detailed report! Tom- There is a rich set of trace points available in the RPC/RDMA implementation in 5.4/5.5, fwiw. Please keep me in the loop, let me know if there is anything I can do to help. > On Feb 11, 2020, at 2:25 AM, Joerg Roedel wrote: > > Adding Tom's ne

Re: AMD IOMMU stops RDMA NFS from working since kernel 5.5 (bisected)

2020-02-10 Thread Joerg Roedel
Adding Tom's new email address. Tom, can you have a look, please? https://bugzilla.kernel.org/show_bug.cgi?id=206461 seems to be a similar issue. On Tue, Feb 11, 2020 at 06:06:54AM +0100, Andre Tomt wrote: > Since upgrading my RDMA lab from kernel 5.4.x to 5.5.x, NFSv4 over RDMA > stopped workin