linux-kernel - Re: [PATCH v4 0/4] mm: ZSWAP swap-out of mTHP folios

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Message-ID: <CAKEwX=MPM8v6WZ3XUD11MkZceo7Y82C0pMTwLJuZX67Wo27WbA@mail.gmail.com>
Date: Tue, 27 Aug 2024 08:30:06 -0700
From: Nhat Pham <nphamcs@...il.com>
To: "Sridhar, Kanchana P" <kanchana.p.sridhar@...el.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, 
	"hannes@...xchg.org" <hannes@...xchg.org>, "yosryahmed@...gle.com" <yosryahmed@...gle.com>, 
	"ryan.roberts@....com" <ryan.roberts@....com>, "Huang, Ying" <ying.huang@...el.com>, 
	"21cnbao@...il.com" <21cnbao@...il.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, 
	"Zou, Nanhai" <nanhai.zou@...el.com>, "Feghali, Wajdi K" <wajdi.k.feghali@...el.com>, 
	"Gopal, Vinodh" <vinodh.gopal@...el.com>
Subject: Re: [PATCH v4 0/4] mm: ZSWAP swap-out of mTHP folios

On Tue, Aug 27, 2024 at 8:23 AM Nhat Pham <nphamcs@...il.com> wrote:
>
> On Mon, Aug 26, 2024 at 11:08 PM Sridhar, Kanchana P
> <kanchana.p.sridhar@...el.com> wrote:
> Yeah that's a bit unfair still. Wild idea, but what about we compare
> SSD without zswap (or SSD with zswap, but without this patch series so
> that mTHP are not zswapped) v.s zswap-on-zram (i.e with a backing
> swapfile on zram block device).
>
> It is stupid, I know. But let's take advantage of the fact that zram
> is not charged to cgroup, pretending that its memory foot print is
> empty?
>
> I don't know how zram works though, so my apologies if it's a stupid
> suggestion :)

Oh nvm, looks like that's what you're already doing.

That said, the lz4 column is soooo bad still, whereas the deflate-iaa
clearly shows improvement! This means it could be
compressor-dependent.

Can you try it with zstd?