From: Jason Gunthorpe <jgg@nvidia.com>
To: Bob Pearson <rpearsonhpe@gmail.com>
Cc: Bernard Metzler <BMT@zurich.ibm.com>,
Zhu Yanjun <zyjzyj2000@gmail.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: question about the completion tasklet in the rxe driver
Date: Tue, 21 Mar 2023 09:54:19 -0300 [thread overview]
Message-ID: <ZBmo+3s9herDiBR7@nvidia.com> (raw)
In-Reply-To: <3d8576fc-eab5-c962-95bb-badadd18c85f@gmail.com>
On Thu, Mar 16, 2023 at 12:14:30PM -0500, Bob Pearson wrote:
> And you did. I am not sure why the mlx5 driver defers the completion handler call
> to a tasklet. I could be that it gets called in a hard interrupt and completion
> handling is deferred to a soft interrupt context. But for rxe the completion
> is always already in a soft interrupt context or a process context.
mlx5_eq_comp_int() is a hard IRQ context
mlx5_cq_tasklet_cb() is in a tasklet context
It has some logic that it only does a certain amount of work per
tasklet call and then it reschedules itself to run again.
mlx5_ib_cq_comp() is in a tasklet context
Jason
next prev parent reply other threads:[~2023-03-21 12:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 21:56 question about the completion tasklet in the rxe driver Bob Pearson
2023-03-16 9:40 ` Bernard Metzler
2023-03-16 17:14 ` Bob Pearson
2023-03-16 18:18 ` Bernard Metzler
2023-03-21 12:54 ` Jason Gunthorpe [this message]
2023-03-19 9:02 ` Zhu Yanjun
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