; Nicholas A. Bellinger; Or Gerlitz; Doug Ledford; Eli Cohen
Subject: Re: [PATCH 1/2] mlx4: Expose correct max_sge_rd limit
> Hello Sagi,
>
> Is this the same issue as what has been discussed in
> http://www.spinics.net/lists/linux-rdma/msg21799.html ?
Looks like it.
I think this pat
Hello Sagi,
Is this the same issue as what has been discussed in
http://www.spinics.net/lists/linux-rdma/msg21799.html ?
Looks like it.
I think this patch addresses this issue, but lets CC Eli
to comment if I'm missing something.
Thanks for digging this up...
Sagi.
--
To unsubscribe from thi
On 10/27/2015 02:40 AM, Sagi Grimberg wrote:
mlx4 devices (ConnectX-2, ConnectX-3) can not issue
max_sge in a single RDMA_READ request (resulting in
a completion error). Thus, expose lower max_sge_rd
to avoid this issue.
Signed-off-by: Sagi Grimberg
---
drivers/infiniband/hw/mlx4/main.c |
But AFAIR, the magic number was 28... how this goes hand in hand with
your findings?
mlx4 max_sge is 32, and isert does max_sge - 2 = 30.
So it always used 30... and I run it reliably with this for a while now.
This thing exists before I was involved so I might not be familiar with
all the deta
On 10/27/2015 6:03 PM, Sagi Grimberg wrote:
So from my discussions with the HW folks a RDMA_READ wqe cannot exceed
512B. The wqe control segment is 16 bytes, the rdma section is 12 bytes
(rkey + raddr) and each sge is 16 bytes so the computation is:
(512B-16B-12B)/16B = 30.
But AFAIR, the mag
On 27/10/2015 16:39, Or Gerlitz wrote:
On 10/27/2015 11:40 AM, Sagi Grimberg wrote:
mlx4 devices (ConnectX-2, ConnectX-3) can not issue
max_sge in a single RDMA_READ request (resulting in
a completion error). Thus, expose lower max_sge_rd
to avoid this issue.
Sagi,
Hey Or,
Still, this pa
On 10/27/2015 11:40 AM, Sagi Grimberg wrote:
mlx4 devices (ConnectX-2, ConnectX-3) can not issue
max_sge in a single RDMA_READ request (resulting in
a completion error). Thus, expose lower max_sge_rd
to avoid this issue.
Sagi,
I can hear your pain when wearing the iser target driver maintainer
mlx4 devices (ConnectX-2, ConnectX-3) can not issue
max_sge in a single RDMA_READ request (resulting in
a completion error). Thus, expose lower max_sge_rd
to avoid this issue.
Signed-off-by: Sagi Grimberg
---
drivers/infiniband/hw/mlx4/main.c |3 ++-
1 files changed, 2 insertions(+), 1 delet
