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Mon, 7 Oct 2019 13:40:23 +0000 (UTC) Received: from dresden.str.redhat.com (unknown [10.40.205.196]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 56C5160C4B; Mon, 7 Oct 2019 13:40:19 +0000 (UTC) Subject: Re: [PATCH 2/6] block/block-copy: limit copy_range_size to 16 MiB To: Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org References: <20191003171539.12327-1-vsementsov@virtuozzo.com> <20191003171539.12327-3-vsementsov@virtuozzo.com> From: Max Reitz 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: Mon, 7 Oct 2019 15:40:17 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20191003171539.12327-3-vsementsov@virtuozzo.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="f7moLMYL4ws4bdKRFDPMdArt2ipwkPsuI" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Mon, 07 Oct 2019 13:40:23 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] 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, jsnow@redhat.com, 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) --f7moLMYL4ws4bdKRFDPMdArt2ipwkPsuI Content-Type: multipart/mixed; boundary="NrZVrb3IFIFtiqNBc17lXHT7CvEcYF4TZ" --NrZVrb3IFIFtiqNBc17lXHT7CvEcYF4TZ Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 03.10.19 19:15, Vladimir Sementsov-Ogievskiy wrote: > Large copy range may imply memory allocation and large io effort, so > using 2G copy range request may be bad idea. Let's limit it to 16 MiB. > It also helps the following patch to refactor copy-with-offload > fallback to copy-with-bounce-buffer. >=20 > Note, that total memory usage of backup is still not limited, it will > be fixed in further commit. >=20 > Signed-off-by: Vladimir Sementsov-Ogievskiy > --- > block/block-copy.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) Reviewed-by: Max Reitz --NrZVrb3IFIFtiqNBc17lXHT7CvEcYF4TZ-- --f7moLMYL4ws4bdKRFDPMdArt2ipwkPsuI Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl2bQEEACgkQ9AfbAGHV z0D+JQgAtEOB+u/bEIjSK+sRXmLccWJd74jRO2ihjAxRzt9lP6a96XVEKOgZ9ZMG PqyGr+G3FQTv9caVf0awl8piQHdv9TP272Nadlx3U1BO5mFgqwlXagDgnXDpD/kY xnVZkNz0dGEHtfwbzqEilbOvafVrUpvSTLlzU0Okw3H+msSywSZ7H8O/3UYI7+MI tbb1cj7iW5hI8tmZtv+d1dW8Oh6f72vFPra3MJ9hwJvVRD0F1uks7dVWG1u5sKq0 6jfRGAKF4reEA8SUNem5rQNlIr6bQ/1XNZvdUdTz/VdcwFN2T+bcOSc3n+gnraXD gsuRFQHl8dWvK2LUJvTwpHrKNQssjg== =uAcF -----END PGP SIGNATURE----- --f7moLMYL4ws4bdKRFDPMdArt2ipwkPsuI--