From: Jason Gunthorpe <jgg@nvidia.com>
To: Bob Pearson <rpearsonhpe@gmail.com>
Cc: "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: help with performance loss question
Date: Wed, 20 Sep 2023 17:52:30 -0300 [thread overview]
Message-ID: <20230920205230.GK13733@nvidia.com> (raw)
In-Reply-To: <acaf78ec-9c88-572e-9c65-29606f5a895d@gmail.com>
On Wed, Sep 20, 2023 at 02:54:42PM -0500, Bob Pearson wrote:
> Jason,
>
> I am trying to figure out what caused a big drop in performance in the rxe driver between
> v6.5-rc5 and v6.5-rc6. The maximum performance for 'ib_send_bw -F -a' in local loopback mode
> dropped from about 1.9GB/sec to 1.1GB/sec between these two tags. I have also measured the performance
> of a 6.5 kernel with the 6.4 rxe driver and 6.4 infiniband/core drivers and that also shows the lower
> performance so it is not something in the rdma subsystem. (In fact there were no changes in the rxe
> driver from 6.5-rc5 to 6.5-rc6.)
>
> If I type 'git log --oneline v6.5-rc6 ^v6.5-rc5' I get about 360 lines but many of them are merge sets
> that can contain many patches. Is there a way to list all the patches contained between these two
> tags?
I recommend you just do a git bisection, it will be more robust and
360 patches will not take many steps
Jason
next prev parent reply other threads:[~2023-09-20 20:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 19:54 help with performance loss question Bob Pearson
2023-09-20 20:52 ` Jason Gunthorpe [this message]
2023-09-20 23:43 ` Bob Pearson
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