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

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Message-ID: <DM8PR11MB5671177E56AB8064336284E3C9942@DM8PR11MB5671.namprd11.prod.outlook.com>
Date: Tue, 27 Aug 2024 18:43:20 +0000
From: "Sridhar, Kanchana P" <kanchana.p.sridhar@...el.com>
To: Nhat Pham <nphamcs@...il.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>, "Sridhar, Kanchana P"
	<kanchana.p.sridhar@...el.com>
Subject: RE: [PATCH v4 0/4] mm: ZSWAP swap-out of mTHP folios


> -----Original Message-----
> From: Nhat Pham <nphamcs@...il.com>
> Sent: Tuesday, August 27, 2024 8:30 AM
> To: Sridhar, Kanchana P <kanchana.p.sridhar@...el.com>
> Cc: linux-kernel@...r.kernel.org; linux-mm@...ck.org;
> hannes@...xchg.org; yosryahmed@...gle.com; ryan.roberts@....com;
> Huang, Ying <ying.huang@...el.com>; 21cnbao@...il.com; 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?

Sure, I will gather data with zstd.

Thanks,
Kanchana