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Date: Tue, 30 Aug 2022 12:47:08 +0000
From: lic121 <chengtcli@qq.com>
To: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Cc: Morten =?iso-8859-1?Q?Br=F8rup?= <mb@smartsharesystems.com>,
 David Marchand <david.marchand@redhat.com>, dev <dev@dpdk.org>
Subject: Re: [PATCH] eal: zero out new added memory
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On Tue, Aug 30, 2022 at 01:59:16PM +0300, Dmitry Kozlyuk wrote:
> Thank you for the most detailed info!
> 
> 1. If you run the poisoner program the second time,
>    does it also see dirty memory immediately after mmap()?

If I run the poisoner program the second time, no dirty memory.

There could be some difference on how my poisoner program and how
testpmd using mmap. Because I notice that testpmd leaves the hugepage
files under /dev/hugepage/rtemap_xxx even after testpmd exits. But my
poisoner program didn't create any file under /dev/hugepage.

> 
> 2. Kernel 4.19.90-2102 patchlevel 2102 is very high,
>    can there be any unusual patches applied?
>    Your host has "compute" in its name,
>    can it have patches that trade security for performance?

I may need to talk with the kernel team on this. Indeed, I failed to
reprouce the issue on a virtuam machine of kernel
4.18.0-305.12.1.el8_4.x86_64(2M page size instead of 1G).