From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9BDCC56201 for ; Tue, 24 Nov 2020 11:02:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C7512076E for ; Tue, 24 Nov 2020 11:02:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="q75xZPDV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732467AbgKXLCO (ORCPT ); Tue, 24 Nov 2020 06:02:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:59914 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732463AbgKXLCO (ORCPT ); Tue, 24 Nov 2020 06:02:14 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7A9E82083E; Tue, 24 Nov 2020 11:02:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1606215733; bh=1cxLgDpJmbdMl+KoljU+RVmexumupWZLEWD2oMoaKUU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=q75xZPDVFkN48q5ixVGY/INzSkna2IoQiNKgDb4iGJT45iswpwLADZaC+ly61ri94 8re58ReAIjl1Tnv1nU4Or8bpJk8xty90DFENNPZRJeKjb7j+ycPeOjyIMlv6xGWwzZ 3eBoXOh0wLdMYbdnDeNWJqq/1f0SacT67S0XRqYc= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1khW5L-00DE77-AT; Tue, 24 Nov 2020 11:02:11 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Tue, 24 Nov 2020 11:02:11 +0000 From: Marc Zyngier To: Jingyi Wang Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, wanghaibin.wang@huawei.com, yezengruan@huawei.com, shameerali.kolothum.thodi@huawei.com, fanhenglong@huawei.com, prime.zeng@hisilicon.com Subject: Re: [RFC PATCH 0/4] Add support for ARMv8.6 TWED feature In-Reply-To: <9d341a2d-19f8-400c-6674-ef991ab78f62@huawei.com> References: <20200929091727.8692-1-wangjingyi11@huawei.com> <9d341a2d-19f8-400c-6674-ef991ab78f62@huawei.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <10463cb9a0ae167a89300185c1de348c@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: wangjingyi11@huawei.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, wanghaibin.wang@huawei.com, yezengruan@huawei.com, shameerali.kolothum.thodi@huawei.com, fanhenglong@huawei.com, prime.zeng@hisilicon.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 2020-11-13 07:54, Jingyi Wang wrote: > Hi all， > > Sorry for the delay. I have been testing the TWED feature performance > lately. We select unixbench as the benchmark for some items of it is > lock-intensive(fstime/fsbuffer/fsdisk). We run unixbench on a 4-VCPU > VM, and bind every two VCPUs on one PCPU. Fixed TWED value is used and > here is the result. How representative is this? TBH, I only know of two real world configurations: one where the vCPUs are pinned to different physical CPUs (and in this case your patch has absolutely no effect as long as there is no concurrent tasks), and one where there is oversubscription, and the scheduler moves things around as it sees fit, depending on the load. Having two vCPUs pinned per CPU feels like a test that has been picked to give the result you wanted. I'd like to see the full picture, including the case that matters for current use cases. I'm specially interested in the cases where the system is oversubscribed, because TWED is definitely going to screw with the scheduler latency. Thanks, M. -- Jazz is not dead. It just smells funny... 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Tue, 24 Nov 2020 11:02:11 +0000 MIME-Version: 1.0 Date: Tue, 24 Nov 2020 11:02:11 +0000 From: Marc Zyngier To: Jingyi Wang Subject: Re: [RFC PATCH 0/4] Add support for ARMv8.6 TWED feature In-Reply-To: <9d341a2d-19f8-400c-6674-ef991ab78f62@huawei.com> References: <20200929091727.8692-1-wangjingyi11@huawei.com> <9d341a2d-19f8-400c-6674-ef991ab78f62@huawei.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <10463cb9a0ae167a89300185c1de348c@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: wangjingyi11@huawei.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, wanghaibin.wang@huawei.com, yezengruan@huawei.com, shameerali.kolothum.thodi@huawei.com, fanhenglong@huawei.com, prime.zeng@hisilicon.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kvm@vger.kernel.org, catalin.marinas@arm.com, fanhenglong@huawei.com, prime.zeng@hisilicon.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; 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SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201124_060214_623555_E9B8F2BC X-CRM114-Status: GOOD ( 15.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, suzuki.poulose@arm.com, catalin.marinas@arm.com, shameerali.kolothum.thodi@huawei.com, yezengruan@huawei.com, fanhenglong@huawei.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, prime.zeng@hisilicon.com, wanghaibin.wang@huawei.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjAyMC0xMS0xMyAwNzo1NCwgSmluZ3lpIFdhbmcgd3JvdGU6Cj4gSGkgYWxs77yMCj4gCj4g U29ycnkgZm9yIHRoZSBkZWxheS4gSSBoYXZlIGJlZW4gdGVzdGluZyB0aGUgVFdFRCBmZWF0dXJl IHBlcmZvcm1hbmNlCj4gbGF0ZWx5LiBXZSBzZWxlY3QgdW5peGJlbmNoIGFzIHRoZSBiZW5jaG1h cmsgZm9yIHNvbWUgaXRlbXMgb2YgaXQgaXMKPiBsb2NrLWludGVuc2l2ZShmc3RpbWUvZnNidWZm ZXIvZnNkaXNrKS4gV2UgcnVuIHVuaXhiZW5jaCBvbiBhIDQtVkNQVQo+IFZNLCBhbmQgYmluZCBl dmVyeSB0d28gVkNQVXMgb24gb25lIFBDUFUuIEZpeGVkIFRXRUQgdmFsdWUgaXMgdXNlZCBhbmQK PiBoZXJlIGlzIHRoZSByZXN1bHQuCgpIb3cgcmVwcmVzZW50YXRpdmUgaXMgdGhpcz8KClRCSCwg SSBvbmx5IGtub3cgb2YgdHdvIHJlYWwgd29ybGQgY29uZmlndXJhdGlvbnM6IG9uZSB3aGVyZQp0 aGUgdkNQVXMgYXJlIHBpbm5lZCB0byBkaWZmZXJlbnQgcGh5c2ljYWwgQ1BVcyAoYW5kIGluIHRo aXMKY2FzZSB5b3VyIHBhdGNoIGhhcyBhYnNvbHV0ZWx5IG5vIGVmZmVjdCBhcyBsb25nIGFzIHRo ZXJlIGlzCm5vIGNvbmN1cnJlbnQgdGFza3MpLCBhbmQgb25lIHdoZXJlIHRoZXJlIGlzIG92ZXJz dWJzY3JpcHRpb24sCmFuZCB0aGUgc2NoZWR1bGVyIG1vdmVzIHRoaW5ncyBhcm91bmQgYXMgaXQg c2VlcyBmaXQsIGRlcGVuZGluZwpvbiB0aGUgbG9hZC4KCkhhdmluZyB0d28gdkNQVXMgcGlubmVk IHBlciBDUFUgZmVlbHMgbGlrZSBhIHRlc3QgdGhhdCBoYXMgYmVlbgpwaWNrZWQgdG8gZ2l2ZSB0 aGUgcmVzdWx0IHlvdSB3YW50ZWQuIEknZCBsaWtlIHRvIHNlZSB0aGUgZnVsbApwaWN0dXJlLCBp bmNsdWRpbmcgdGhlIGNhc2UgdGhhdCBtYXR0ZXJzIGZvciBjdXJyZW50IHVzZSBjYXNlcy4KSSdt IHNwZWNpYWxseSBpbnRlcmVzdGVkIGluIHRoZSBjYXNlcyB3aGVyZSB0aGUgc3lzdGVtIGlzCm92 ZXJzdWJzY3JpYmVkLCBiZWNhdXNlIFRXRUQgaXMgZGVmaW5pdGVseSBnb2luZyB0byBzY3JldyB3 aXRoCnRoZSBzY2hlZHVsZXIgbGF0ZW5jeS4KClRoYW5rcywKCiAgICAgICAgIE0uCi0tIApKYXp6 IGlzIG5vdCBkZWFkLiBJdCBqdXN0IHNtZWxscyBmdW5ueS4uLgoKX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxp c3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZy YWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=