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From: Dave Hansen <dave.hansen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Andrew Cooper <andrew.cooper3@citrix.com>,
	"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Subject: Re: [patch 3/3] x86/fpu/xsave: Optimize XSAVEC/S when XGETBV1 is supported
Date: Sat, 23 Apr 2022 08:20:18 -0700	[thread overview]
Message-ID: <4cce3734-03e0-ff62-b13e-cd8405d3a8b7@intel.com> (raw)
In-Reply-To: <87bkws6hmc.ffs@tglx>

On 4/22/22 12:30, Thomas Gleixner wrote:
> So I just go and add the XSAVEC support alone as that's actually
> something which _is_ beneficial for guests.

Yeah, agreed.

When I went to test these patches, a bit loop with XSAVEC was ~10%
faster that XSAVEOPT.  This system has XSAVES, so wouldn't have been
using XSAVEOPT in the first place in the kernel.  But, this is at least
one more data point in favor of XSAVEC.

      reply	other threads:[~2022-04-23 15:20 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-04 12:11 [patch 0/3] x86/fpu/xsave: Add XSAVEC support and XGETBV1 utilization Thomas Gleixner
2022-04-04 12:11 ` [patch 1/3] x86/fpu/xsave: Support XSAVEC in the kernel Thomas Gleixner
2022-04-04 16:10   ` Andrew Cooper
2022-04-14 14:43   ` Dave Hansen
2022-04-25 13:11   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2022-04-04 12:11 ` [patch 2/3] x86/fpu/xsave: Prepare for optimized compaction Thomas Gleixner
2022-04-14 15:46   ` Dave Hansen
2022-04-19 12:39     ` Thomas Gleixner
2022-04-19 13:33       ` Thomas Gleixner
2022-04-04 12:11 ` [patch 3/3] x86/fpu/xsave: Optimize XSAVEC/S when XGETBV1 is supported Thomas Gleixner
2022-04-14 17:24   ` Dave Hansen
2022-04-19 13:43     ` Thomas Gleixner
2022-04-19 21:22       ` Thomas Gleixner
2022-04-20 18:15         ` Tom Lendacky
2022-04-22 19:30           ` Thomas Gleixner
2022-04-23 15:20             ` Dave Hansen [this message]

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