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Wed, 26 Feb 2020 09:11:56 +0000 (UTC) Received: from localhost (unknown [10.43.2.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6FE815C54A; Wed, 26 Feb 2020 09:11:55 +0000 (UTC) Date: Wed, 26 Feb 2020 10:11:53 +0100 From: Igor Mammedov To: Howard Spoelstra Subject: Re: Sudden slowdown of ARM emulation in master Message-ID: <20200226101153.2fd3f7f8@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Richard Henderson , QEMU Developers , Niek Linnenbank , qemu-arm , Paolo Bonzini , Philippe =?UTF-8?B?TWF0aGlldS1EYXVkw6k=?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 26 Feb 2020 09:45:48 +0100 Howard Spoelstra wrote: > On Wed, Feb 26, 2020 at 9:42 AM Peter Maydell > wrote: > > > On Tue, 25 Feb 2020 at 23:08, Niek Linnenbank > > wrote: > > > > > Just now I was working on some small fixes for the cubieboard machine > > and rebasing my Allwinner H3 branches. > > > While doing some testing, I noticed that suddenly the machines were much > > slower than before. > > > I only see this happening when I rebase to this commit: > > > ca6155c0f2bd39b4b4162533be401c98bd960820 ("Merge tag 'patchew/ > > 20200219160953.13771-1-imammedo@redhat.com' of > > https://github.com/patchew-project/qemu into HEAD") > > > > Yeah, I noticed a slowdown yesterday as well, but haven't tracked it down > > as yet. The first thing would be to do a git bisect to try to narrow > > down what commit caused it. > > > > thanks > > -- PMM > > > > > Perhaps related? I noticed a slow down on qemu-system-ppc and tracked it > down here: > https://lists.nongnu.org/archive/html/qemu-devel/2020-02/msg07262.html There might be some implicit dependency in TCG that depends on ram_size. I'm looking for what it could be > Best, > Howard