From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:51284) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T0wLX-000624-GG for qemu-devel@nongnu.org; Mon, 13 Aug 2012 11:14:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T0wLP-0002Jm-N1 for qemu-devel@nongnu.org; Mon, 13 Aug 2012 11:14:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36438) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T0wLP-0002Jh-Ee for qemu-devel@nongnu.org; Mon, 13 Aug 2012 11:14:15 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q7DFEEkv014966 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 13 Aug 2012 11:14:14 -0400 Message-ID: <502919C5.5010100@redhat.com> Date: Mon, 13 Aug 2012 09:14:13 -0600 From: Eric Blake MIME-Version: 1.0 References: <1344855057-32509-1-git-send-email-quintela@redhat.com> <50291634.1060407@redhat.com> <87393qygm1.fsf@elfo.mitica> In-Reply-To: <87393qygm1.fsf@elfo.mitica> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------enig1741F04E4668CA810AEE345C" Subject: Re: [Qemu-devel] [RFC 0/7] Migration stats List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: quintela@redhat.com Cc: qemu-devel@nongnu.org, lcapitulino@redhat.com This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig1741F04E4668CA810AEE345C Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 08/13/2012 09:08 AM, Juan Quintela wrote: >> >> Should we have some sort of stat for the number of pages that are sent= >> more than once, and/or for the maximum count of times that a given pag= e >> was sent? Having hot/cold page analysis might make it easier to decid= e >> in the future which pages to avoid sending until the very end, and >> knowing how many pages are sent multiple times as well as the maximum >> times any one page is sent might help. >=20 > That is not trivial to do without "duplicating" the bitmap. Bitmap is > already quite big on machines with huge memory. Adding a field to show= > how many times a page have been sent sounds too much. Furthermore, how= > could this information could be used externally. No big loss, then. I was just wondering out loud, and don't really have a particular need for this information. I guess with XBZRLE, you _do_ have a count of how many cache hits you had, which is somewhat related (a cache hit implies sending a page more than once). --=20 Eric Blake eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --------------enig1741F04E4668CA810AEE345C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBCAAGBQJQKRnFAAoJEKeha0olJ0NqJkQIAKBlFjMbTvNLZaHfurWsMhWN kW9X0I4vbyuFwKo1Gc4UM54s7dwWwQ8icFwM3Rm6NebwR+ecy4DXf8cp69NMVmab KvOkPcrWoq+71mkzAQMHjOCA8oIa0kws6OehfX7qHZ2YylBhKH4LNr0qd1dpAyZh uDFbzjVx+1gQok7Ruu3sIKkFh2oUjuLFDHJPTNdOISFMiGFOP+pdU+Uqj6P0bwtN jxDJK11eNEJgyb5aVJqXvmEQwTJnsY4mmS/lDyGDNasy/ek6QkjwL+vTZhIlYk5S tSHk35tzazZRJRMvfXOc0/t2Mhc/1QFilMtPHJxNHN+szhJeKupKdnaOUV9u/0Q= =nA89 -----END PGP SIGNATURE----- --------------enig1741F04E4668CA810AEE345C--