linux-kernel - Re: PCI: latency

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Message-ID: <20211206193925.GA5439@bhelgaas>
Date:   Mon, 6 Dec 2021 13:39:25 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Subhashini Rao Beerisetty <subhashbeerisetty@...il.com>
Cc:     linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        kernelnewbies <kernelnewbies@...nelnewbies.org>
Subject: Re: PCI: latency

On Fri, Dec 03, 2021 at 10:30:58PM +0530, Subhashini Rao Beerisetty wrote:
>  [ Please keep me in CC as I'm not subscribed to the list]
> 
> Hi all,
> 
> We are using the Linux OS on an x86_64 machine. I need to measure the
> PCIe latency on my system, does kernel have any latency measurement
> module for the PCIe bus?

No, unfortunately not.  Maybe perf could help, but I don't know enough
to give you any pointers.

There are a couple tune/trace things like [1], but they're specific to
hardware that you're probably not using.

[1] https://lore.kernel.org/r/20211116090625.53702-1-yangyicong@hisilicon.com