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<p class="MsoPlainText">Hi <a id="OWAAM5D01800FA6F74DA4A1BD457135F74D0E" href="mailto:thomas@monjalon.net">
<span style="font-family:"Calibri",sans-serif;text-decoration:none">@Thomas Monjalon</span></a><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Thanks for the confirmation.<o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText">Thanks and Regards<o:p></o:p></p>
<p class="MsoPlainText"> Shravan S<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: Thomas Monjalon <thomas@monjalon.net> <br>
Sent: Saturday, July 11, 2026 7:55 PM<br>
To: Shravan S (shrraj) <shrraj@cisco.com><br>
Cc: users@dpdk.org; Fan Zhang <fanzhang.oss@gmail.com>; Ashish Gupta <ashish.gupta@marvell.com>; Pablo de Lara <pablo.de.lara.guarch@intel.com><br>
Subject: Re: Subject: [Questions] LZ4 software compression PMD support in DPDK</p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hello,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">11/07/2026 04:38, Shravan S (shrraj):<o:p></o:p></p>
<p class="MsoPlainText">> Hi DPDK Community,<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> I am looking for clarification regarding LZ4 compression algorithm support within the DPDK CompressDev framework.<o:p></o:p></p>
<p class="MsoPlainText">> While looking at the rte_comp.h API, I see references to rte_comp_lz4_params, and the dpdk-test-compress-perf tool lists --algo lz4 as an eligible flag. However, looking through the available software virtual devices (like the ZLIB
PMD or ISA-L PMD), they primarily target DEFLATE.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The drivers support is written in this table:<o:p></o:p></p>
<p class="MsoPlainText"><a href="https://doc.dpdk.org/guides/compressdevs/overview.html"><span style="color:windowtext;text-decoration:none">https://doc.dpdk.org/guides/compressdevs/overview.html</span></a><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">As you can see, only mlx5 supports LZ4 for its hardware.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p></o:p></p>
<p class="MsoPlainText">> My Questions:<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> 1. Is there an official, built-in software (SW) virtual PMD (compress_lz4) available in DPDK for LZ4 compression/decompression?<o:p></o:p></p>
<p class="MsoPlainText">> 2. If a native SW PMD does not exist, are there plans to introduce a reference software driver based on the liblz4 library?<o:p></o:p></p>
<p class="MsoPlainText">> 3. What is the recommended approach if I need to run LZ4 software compression over vdevs alongside other DPDK processing pipelines?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">There is no plan regarding LZ4 in software, but you are welcome to propose a solution.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> My Environment/Context:<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> * DPDK Version: DPDK25.11<o:p></o:p></p>
<p class="MsoPlainText">> * Operating System: Marvel CN106xx Octeon boards with ARM architecture.<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> cat /etc/os-release<o:p></o:p></p>
<p class="MsoPlainText">> NAME=Buildroot<o:p></o:p></p>
<p class="MsoPlainText">> VERSION=2020.02.3-ge935b06c8-dirty<o:p></o:p></p>
<p class="MsoPlainText">> ID=buildroot<o:p></o:p></p>
<p class="MsoPlainText">> VERSION_ID=2020.02.3<o:p></o:p></p>
<p class="MsoPlainText">> PRETTY_NAME="Buildroot 2020.02.3"<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> uname -a<o:p></o:p></p>
<p class="MsoPlainText">> Linux oct2 5.4.210 #15 SMP PREEMPT Thu Aug 15 12:23:54 CST 2024 aarch64 GNU/Linux<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> * Target Use Case: We run user space TCP/IP Stack on Marvel CN106xx Octeon ARM boards, as part of FCIP Solutions.<o:p></o:p></p>
<p class="MsoPlainText">> We need to enable LZ4 software compression support and DPDK don't have software PMD support for LZ4 compression.<o:p></o:p></p>
<p class="MsoPlainText">> We are looking for support or any other approach to achieve this implementation.<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> Thanks and Regards<o:p></o:p></p>
<p class="MsoPlainText">> Shravan S<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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