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From: Peter Xu <peterx@redhat.com>
To: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: David Hildenbrand <david@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Axel Rasmussen <axelrasmussen@google.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Nadav Amit <nadav.amit@gmail.com>
Subject: Re: [PATCH] mm/uffd: UFFD_FEATURE_WP_ZEROPAGE
Date: Fri, 17 Feb 2023 18:10:10 -0500	[thread overview]
Message-ID: <Y/AJUi4o5hOKDkgy@x1n> (raw)
In-Reply-To: <427298c4-0da9-059f-02ff-c5147d317c87@collabora.com>

Hi, Muhammad,

On Fri, Feb 17, 2023 at 05:31:19PM +0500, Muhammad Usama Anjum wrote:
> I've just ran my single threaded selftest [1] over an over again to get
> some numbers.
> 
> Without zeropage
> qemu has 6 cores: 26.0355

Did you count in the time of read prefault?  Or did you not prefault at
all?

> With zeropage
> qemu has 6 cores: 39.203
> 
> 33% worse performance with zero pages
> 
> Definitely, there can be better benchmark application. Please let me know
> if I should write better benchmarks on my end.
> 
> [1]
> https://lore.kernel.org/all/20230202112915.867409-7-usama.anjum@collabora.com

I'll have a closer look too next week.

Thanks,

-- 
Peter Xu



  reply	other threads:[~2023-02-17 23:10 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-15 21:02 [PATCH] mm/uffd: UFFD_FEATURE_WP_ZEROPAGE Peter Xu
2023-02-16 10:47 ` David Hildenbrand
2023-02-16 16:29   ` Peter Xu
2023-02-16 17:00     ` David Hildenbrand
2023-02-16 17:55       ` Peter Xu
2023-02-16 18:23         ` David Hildenbrand
2023-02-16 20:08           ` Peter Xu
2023-02-17 11:41             ` David Hildenbrand
2023-02-17 23:04               ` Peter Xu
2023-02-21 12:43                 ` David Hildenbrand
2023-02-21 23:13                   ` Peter Xu
2023-02-22 17:02                     ` David Hildenbrand
2023-02-22 20:37                       ` Peter Xu
2023-02-23 14:35                         ` David Hildenbrand
2023-02-28 19:42                           ` Peter Xu
2023-03-02 14:12                             ` David Hildenbrand
2023-02-17 12:31             ` Muhammad Usama Anjum
2023-02-17 23:10               ` Peter Xu [this message]
2023-02-20  7:15                 ` Muhammad Usama Anjum

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