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

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Message-ID: <SJ0PR11MB567838FB8EA8CCC8479BFEB7C9952@SJ0PR11MB5678.namprd11.prod.outlook.com>
Date: Wed, 28 Aug 2024 07:27:04 +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: Sridhar, Kanchana P <kanchana.p.sridhar@...el.com>
> Sent: Tuesday, August 27, 2024 11:43 AM
> To: Nhat Pham <nphamcs@...il.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>;
> 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.

I will be sending out a v5 shortly with data gathered with zstd.

Thanks,
Kanchana

> 
> Thanks,
> Kanchana