linux-kernel - Re: Test throughput on PCIe interface

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Message-ID: <20160722161406.GC20646@localhost>
Date:	Fri, 22 Jul 2016 11:14:06 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Muni Sekhar <munisekharrms@...il.com>
Cc:	linux-pci@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: Test throughput on PCIe interface

[+cc perf folks]

On Fri, Jul 22, 2016 at 05:59:51PM +0530, Muni Sekhar wrote:
> Hi All,
> 
> 
> We have xilinx PCIe endpoint with DMA reference block.
> 
> 
> The DMA-REF block provides a mechanism to DMA(also supports
> Scatter-Gather DMA) transfer data at the maximum rate between host
> (CPU) memory and a FIFO in the DMA-REF block.
> 
> 
> DMA-REF block provides the loopback. The intention is to use this
> block in production and self-test, to check that the PCIe bus is
> operating at the expected maximum transfer speed.
> 
> 
> Does kernel has any standard utilities to test throughput on PCIe interface?

I know some PCIe controllers devices do have performance monitors, and
perf might support some of them, but I don't know any details.

Bjorn