From: Borislav Petkov <bp@alien8.de>
To: kernel test robot <xiaolong.ye@intel.com>,
Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Markus Trippelsdorf <markus@trippelsdorf.de>,
Adam Borowski <kilobyte@angband.pl>,
Brian Gerst <brgerst@gmail.com>,
Johannes Hirte <johannes.hirte@datenkhaos.de>,
lkp@01.org
Subject: Re: [lkp-robot] [x86/mm] c4c3c3c2d0: will-it-scale.per_process_ops -61.0% regression
Date: Mon, 16 Oct 2017 12:15:48 +0200 [thread overview]
Message-ID: <20171016101548.v3l3jgcbdogrvbvh@pd.tnic> (raw)
In-Reply-To: <20171016023917.GG26196@yexl-desktop>
On Mon, Oct 16, 2017 at 10:39:17AM +0800, kernel test robot wrote:
>
> Greeting,
>
> FYI, we noticed a -61.0% regression of will-it-scale.per_process_ops due to commit:
>
>
> commit: c4c3c3c2d00826c88b5c02c20e80704664424b9b ("x86/mm: Flush more aggressively in lazy TLB mode")
> url: https://github.com/0day-ci/linux/commits/Borislav-Petkov/x86-mm-Flush-more-aggressively-in-lazy-TLB-mode/20171011-115901
>
>
> in testcase: will-it-scale
> on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory
Say what now?
This is actually what got applied upstream:
b956575bed91 ("x86/mm: Flush more aggressively in lazy TLB mode")
and AFAICT, that machine is BDW and it should have PCID, right?
Or wait, that's a guest so PCID is probably not even usable for guests.
Or should we disable it in VMs?
I'm confused. Andy?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-10-16 10:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-09 16:50 [RFC PATCH] x86/mm: Flush more aggressively in lazy TLB mode Andy Lutomirski
2017-10-09 17:02 ` Borislav Petkov
2017-10-09 17:36 ` Borislav Petkov
2017-10-09 17:50 ` Andy Lutomirski
2017-10-09 18:08 ` Borislav Petkov
2017-10-09 18:31 ` Andy Lutomirski
2017-10-13 9:07 ` demfloro
2017-10-14 10:49 ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2017-10-14 12:34 ` [PATCH] x86/mm: Rip out the TLB benchmarking knob Borislav Petkov
2017-10-14 17:01 ` Andy Lutomirski
2017-10-14 16:34 ` [tip:x86/urgent] x86/mm: Flush more aggressively in lazy TLB mode Andy Lutomirski
2017-10-14 17:00 ` Andy Lutomirski
2017-10-16 2:39 ` [lkp-robot] [x86/mm] c4c3c3c2d0: will-it-scale.per_process_ops -61.0% regression kernel test robot
2017-10-16 10:15 ` Borislav Petkov [this message]
2017-10-17 1:06 ` Andy Lutomirski
2017-10-17 4:57 ` Markus Trippelsdorf
2017-10-17 8:00 ` Borislav Petkov
2017-10-17 22:06 ` Andy Lutomirski
2017-10-18 14:26 ` Borislav Petkov
2017-10-18 1:59 ` Ye Xiaolong
2017-10-18 8:11 ` Borislav Petkov
2017-10-17 6:04 ` Ye Xiaolong
2017-10-10 8:22 ` [RFC PATCH] x86/mm: Flush more aggressively in lazy TLB mode Markus Trippelsdorf
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