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Fri, 15 Sep 2023 08:09:12 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Fri, 15 Sep 2023 08:09:12 +0100 From: David Laight To: 'David Howells' , Al Viro , Linus Torvalds CC: Jens Axboe , Christoph Hellwig , "Christian Brauner" , Matthew Wilcox , "Brendan Higgins" , David Gow , "linux-fsdevel@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kunit-dev@googlegroups.com" , "linux-kernel@vger.kernel.org" , Andrew Morton , Christian Brauner , David Hildenbrand , John Hubbard Subject: RE: [RFC PATCH 9/9] iov_iter: Add benchmarking kunit tests for UBUF/IOVEC Thread-Topic: [RFC PATCH 9/9] iov_iter: Add benchmarking kunit tests for UBUF/IOVEC Thread-Index: AQHZ51kQ26Nrcgq1TkqWWiI5nPv6dLAbdkPg Date: Fri, 15 Sep 2023 07:09:12 +0000 Message-ID: References: <20230914221526.3153402-1-dhowells@redhat.com> <20230914221526.3153402-10-dhowells@redhat.com> In-Reply-To: <20230914221526.3153402-10-dhowells@redhat.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D92F92000D X-Stat-Signature: f8xshpdy9186u99rii6shgco4ttyfef5 X-HE-Tag: 1694761763-848711 X-HE-Meta: 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 hQ8CaH/v JCfM2k3lX7bxPFjqVeVDzklp8HBHsI/u48gpjEQim5oZZFWot5HG+uwljriu2NmuFTLEc8QdaeBRwL+UFiELOwHJiwB6rVjdJ81jvv620a/cL9K6WZeu+IR+2cv/IuITB73t6o8UMWyQriHbjUs/a4x6mInR/4+D4cVMN3c+verYaeZlS8UFKUiWnYuuu+qA8GJzJ/bZeQdsqu+gh3ScXczu9mxgNDOV6YGIoTHdcO9NJ/QZWW0OVGvPEYc/w5V0uQRNMjX0oh8nBvlALhJBMB/xDzQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: David Howells > Sent: 14 September 2023 23:15 >=20 > Add kunit tests to benchmark 256MiB copies to a UBUF iterator and an IOVE= C > iterator. This attaches a userspace VM with a mapped file in it > temporarily to the test thread. Isn't that going to be completely dominated by the cache fills from memory? I'd have thought you'd need to use something with a lot of small fragments so that the iteration code dominates the copy. Some measurements can be made using readv() and writev() on /dev/zero and /dev/null. =09David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1= PT, UK Registration No: 1397386 (Wales)