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Fri, 20 Sep 2019 11:10:08 +0000 (UTC) Received: from dresden.str.redhat.com (unknown [10.40.205.102]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7E12260C18; Fri, 20 Sep 2019 11:10:06 +0000 (UTC) Subject: Re: [PATCH v5 0/5] qcow2: async handling of fragmented io To: Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org References: <20190916175324.18478-1-vsementsov@virtuozzo.com> From: Max Reitz Openpgp: preference=signencrypt Autocrypt: addr=mreitz@redhat.com; prefer-encrypt=mutual; keydata= mQENBFXOJlcBCADEyyhOTsoa/2ujoTRAJj4MKA21dkxxELVj3cuILpLTmtachWj7QW+TVG8U /PsMCFbpwsQR7oEy8eHHZwuGQsNpEtNC2G/L8Yka0BIBzv7dEgrPzIu+W3anZXQW4702+uES U29G8TP/NGfXRRHGlbBIH9KNUnOSUD2vRtpOLXkWsV5CN6vQFYgQfFvmp5ZpPeUe6xNplu8V mcTw8OSEDW/ZnxJc8TekCKZSpdzYoxfzjm7xGmZqB18VFwgJZlIibt1HE0EB4w5GsD7x5ekh awIe3RwoZgZDLQMdOitJ1tUc8aqaxvgA4tz6J6st8D8pS//m1gAoYJWGwwIVj1DjTYLtABEB AAG0HU1heCBSZWl0eiA8bXJlaXR6QHJlZGhhdC5jb20+iQFTBBMBCAA9AhsDBQkSzAMABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheABQJVzie5FRhoa3A6Ly9rZXlzLmdudXBnLm5ldAAKCRD0 B9sAYdXPQDcIB/9uNkbYEex1rHKz3mr12uxYMwLOOFY9fstP5aoVJQ1nWQVB6m2cfKGdcRe1 2/nFaHSNAzT0NnKz2MjhZVmcrpyd2Gp2QyISCfb1FbT82GMtXFj1wiHmPb3CixYmWGQUUh+I AvUqsevLA+WihgBUyaJq/vuDVM1/K9Un+w+Tz5vpeMidlIsTYhcsMhn0L9wlCjoucljvbDy/ 8C9L2DUdgi3XTa0ORKeflUhdL4gucWoAMrKX2nmPjBMKLgU7WLBc8AtV+84b9OWFML6NEyo4 4cP7cM/07VlJK53pqNg5cHtnWwjHcbpGkQvx6RUx6F1My3y52vM24rNUA3+ligVEgPYBuQEN BFXOJlcBCADAmcVUNTWT6yLWQHvxZ0o47KCP8OcLqD+67T0RCe6d0LP8GsWtrJdeDIQk+T+F xO7DolQPS6iQ6Ak2/lJaPX8L0BkEAiMuLCKFU6Bn3lFOkrQeKp3u05wCSV1iKnhg0UPji9V2 W5eNfy8F4ZQHpeGUGy+liGXlxqkeRVhLyevUqfU0WgNqAJpfhHSGpBgihUupmyUg7lfUPeRM DzAN1pIqoFuxnN+BRHdAecpsLcbR8sQddXmDg9BpSKozO/JyBmaS1RlquI8HERQoe6EynJhd 64aICHDfj61rp+/0jTIcevxIIAzW70IadoS/y3DVIkuhncgDBvGbF3aBtjrJVP+5ABEBAAGJ ASUEGAEIAA8FAlXOJlcCGwwFCRLMAwAACgkQ9AfbAGHVz0CbFwf9F/PXxQR9i4N0iipISYjU sxVdjJOM2TMut+ZZcQ6NSMvhZ0ogQxJ+iEQ5OjnIputKvPVd5U7WRh+4lF1lB/NQGrGZQ1ic alkj6ocscQyFwfib+xIe9w8TG1CVGkII7+TbS5pXHRxZH1niaRpoi/hYtgzkuOPp35jJyqT/ /ELbqQTDAWcqtJhzxKLE/ugcOMK520dJDeb6x2xVES+S5LXby0D4juZlvUj+1fwZu+7Io5+B bkhSVPb/QdOVTpnz7zWNyNw+OONo1aBUKkhq2UIByYXgORPFnbfMY7QWHcjpBVw9MgC4tGeF R4bv+1nAMMxKmb5VvQCExr0eFhJUAHAhVg== Message-ID: Date: Fri, 20 Sep 2019 13:10:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190916175324.18478-1-vsementsov@virtuozzo.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Qa4NBWBcEazN6ap9w4pzEj5PB5Shgkh8x" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.65]); Fri, 20 Sep 2019 11:10:08 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 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: kwolf@redhat.com, den@openvz.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Qa4NBWBcEazN6ap9w4pzEj5PB5Shgkh8x Content-Type: multipart/mixed; boundary="1VeI5mY2MKNuRV2LU9rEOXP8ezAeryQfU"; protected-headers="v1" From: Max Reitz To: Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, den@openvz.org Message-ID: Subject: Re: [PATCH v5 0/5] qcow2: async handling of fragmented io References: <20190916175324.18478-1-vsementsov@virtuozzo.com> In-Reply-To: <20190916175324.18478-1-vsementsov@virtuozzo.com> --1VeI5mY2MKNuRV2LU9rEOXP8ezAeryQfU Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 16.09.19 19:53, Vladimir Sementsov-Ogievskiy wrote: > Hi all! >=20 > Here is an asynchronous scheme for handling fragmented qcow2 > reads and writes. Both qcow2 read and write functions loops through > sequential portions of data. The series aim it to parallelize these > loops iterations. > It improves performance for fragmented qcow2 images, I've tested it > as described below. Thanks again, applied to my block branch: https://git.xanclic.moe/XanClic/qemu/commits/branch/block > v5: fix 026 and rebase on Max's block branch [perf results not updated]= : >=20 > 01: new, prepare 026 to not fail > 03: - drop read_encrypted blkdbg event [Kevin] > - assert((x & (BDRV_SECTOR_SIZE - 1)) =3D=3D 0) -> assert(QEMU_IS_A= LIGNED(x, BDRV_SECTOR_SIZE)) [rebase] > - full host offset in argument of qcow2_co_decrypt [rebase] > 04: - substitute remaining qcow2_co_do_pwritev by qcow2_co_pwritev_task= in comment [Max] > - full host offset in argument of qcow2_co_encrypt [rebase] > 05: - Now patch don't affect 026 iotest, so its output is not changed >=20 > Rebase changes seems trivial, so, I've kept r-b marks. (For the record, I didn=E2=80=99t consider them trivial, or I=E2=80=99d=E2= =80=99ve applied Maxim=E2=80=99s series on top of yours. I consider a conflict to be triv= ially resolvable only if there is only one way of doing it; but when I resolved the conflicts myself, I resolved the one in patch 3 differently from you =E2=80=93 I added an offset_in_cluster variable to qcow2_co_preadv_encrypted(). Sure, it=E2=80=99s still simple and the dif= ference is minor, but that was exactly where I thought that I can=E2=80=99t consi= der this trivial.) Max --1VeI5mY2MKNuRV2LU9rEOXP8ezAeryQfU-- --Qa4NBWBcEazN6ap9w4pzEj5PB5Shgkh8x Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl2Es4wACgkQ9AfbAGHV z0D5Iwf/U2HtNixP4gjdTwceqvutOMK/C5MnFwawUjz6d84+Iz52VS0htukVBTXF lQeczce5GaOXQIPSWD6LonAOm1vYGiiP4CR3RdHMmuULmrJQ6ZtXuyEULh6JipJ1 wbir/NNTW7Fi5MFmVXoVMt36SwCFqwTHZ72xA0TI+gEBb1SkSupkXMUbWlftjGN5 kElnG0O/rQwpamtl3AdzX4VKpjHHxmyzbgOvbjRScumN7VNu4bXMctCSCPuBndCG 3hJZkFDBTEnzBJJpFoME6F0H1MWOWTaNXQvcYSQdm2UbxSys5EadQSjDkt323bP8 VGW5zua2KdHexiZgJjgfib8CMI9a8w== =qMep -----END PGP SIGNATURE----- --Qa4NBWBcEazN6ap9w4pzEj5PB5Shgkh8x--