From: Jason Gunthorpe <jgg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org,
vladimirk-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org
Subject: Re: [PATCH 1/2] net/mlx5: increase async EQ to avoid EQ overrun
Date: Mon, 5 Feb 2018 11:09:04 -0700 [thread overview]
Message-ID: <20180205180904.GB11446@mellanox.com> (raw)
In-Reply-To: <1517840992-29813-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
On Mon, Feb 05, 2018 at 04:29:51PM +0200, Max Gurtovoy wrote:
> Currently the async EQ has 256 entries only. It might not be big enough
> for the SW to handle all the needed pending events. For example, in case
> of many QPs (let's say 1024) connected to a SRQ created using NVMeOF target
> and the target goes down, the FW will raise 1024 "last WQE reached" events
> and may cause EQ overrun. Increase the EQ to more reasonable size, that beyond
> it the FW should be able to delay the event and raise it later on using internal
> backpressure mechanism.
If the firmware has an internal backpressure meachanism then why
would we get a EQ overrun?
Do we need to block adding too many QPs to a SRQ as well or something
like that?
Jason
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next prev parent reply other threads:[~2018-02-05 18:09 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-05 14:29 [PATCH 1/2] net/mlx5: increase async EQ to avoid EQ overrun Max Gurtovoy
2018-02-05 14:29 ` [PATCH 2/2] net/mlx5: fix affinity mask for completion vectors Max Gurtovoy
2018-02-05 14:29 ` Max Gurtovoy
2018-02-05 14:36 ` Sagi Grimberg
[not found] ` <1517840992-29813-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-05 15:28 ` [PATCH 1/2] net/mlx5: increase async EQ to avoid EQ overrun Sagi Grimberg
2018-02-05 16:02 ` Doug Ledford
[not found] ` <1517846530.3936.71.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-02-05 16:10 ` Leon Romanovsky
2018-02-05 18:09 ` Jason Gunthorpe [this message]
[not found] ` <20180205180904.GB11446-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-05 23:11 ` Max Gurtovoy
[not found] ` <d572b570-0844-e441-19a0-e6804557fb58-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-05 23:16 ` Jason Gunthorpe
[not found] ` <20180205231617.GQ11446-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-08 5:45 ` Saeed Mahameed
[not found] ` <CALzJLG9QQ_B4xj-E+HtpxUWZhFU9eWeqSNHSaQjf5HH=9TPXTg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-08 16:26 ` Jason Gunthorpe
[not found] ` <20180208162605.GK9051-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-08 16:39 ` Leon Romanovsky
2018-02-08 18:58 ` Saeed Mahameed
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