linux-kernel - Re: [RFC v2 PATCH 0/5] Promotion of Unmapped Page Cache Folios.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z27KdHq2cwPg0w7S@gourry-fedora-PF4VCD3F>
Date: Fri, 27 Dec 2024 10:40:36 -0500
From: Gregory Price <gourry@...rry.net>
To: "Huang, Ying" <ying.huang@...ux.alibaba.com>
Cc: Gregory Price <gourry@...rry.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, nehagholkar@...a.com,
	abhishekd@...a.com, kernel-team@...a.com, david@...hat.com,
	nphamcs@...il.com, akpm@...ux-foundation.org, hannes@...xchg.org,
	kbusch@...a.com
Subject: Re: [RFC v2 PATCH 0/5] Promotion of Unmapped Page Cache Folios.

On Fri, Dec 27, 2024 at 10:16:42AM +0800, Huang, Ying wrote:
> Gregory Price <gourry@...rry.net> writes:
> 
> > On Sun, Dec 22, 2024 at 03:09:44PM +0800, Huang, Ying wrote:
> >> Gregory Price <gourry@...rry.net> writes:
> >> > That's 3-6% performance in this contrived case.
> >> 
> >> This is small too.
> >>
> >
> > Small is relative.  3-6% performance increase across millions of servers
> > across a year is a non trivial speedup for such a common operation.
> 
> If we cannot only get 3-6% performance increase in a micro-benchmark,
> how much can we get from a real life workloads?
> 
> Anyway, we need to prove the usefulness of the change via data.  3-6%
> isn't some strong data.
> 
> Can we measure the largest improvement?  For example, run the benchmark
> with all file pages in DRAM and CXL.mem via numa binding, and compare.
>

I can probably come up with something, will rework some stuff.

~Gregory