From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51141) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VH43r-0003Zk-Sl for qemu-devel@nongnu.org; Tue, 03 Sep 2013 23:47:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VH43k-0002Cs-IN for qemu-devel@nongnu.org; Tue, 03 Sep 2013 23:47:19 -0400 Date: Wed, 4 Sep 2013 11:47:04 +0800 From: xuanmao_001 Mime-Version: 1.0 Message-ID: <2013090411470490667813@163.com> Content-Type: multipart/alternative; boundary="----=_001_NextPart421614202388_=----" Subject: [Qemu-devel] question about qemu disk cache mode Reply-To: xuanmao_001 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel , qemu-discuss Cc: Kevin Wolf This is a multi-part message in MIME format. ------=_001_NextPart421614202388_=---- Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: base64 RGVhciBxZW11ZXJzOg0KDQpteSBxZW11LWt2bSB2ZXJzaW9uIGlzIDEuMC4xDQpJIHdvdWxkIGxp a2UgdG8gZmlndXJlIG91dCB0aGUgcWVtdSBkaXNrIGNhY2hlIG1vZGUuIEkgaGF2ZSB2aXNpdGVk IHRoZSBxZW11LW9wdGlvbnMuaHgNCnRoZXJlIGlzIHR3byBjYWNoZSB0aGF0IEkgZGlkbid0IHVu ZGVyc3RhbmQ6IHRoZSBob3N0IGNhY2hlIHBhZ2UgYW5kIHRoZSBxZW11IGRpc2sgd3JpdGUgY2Fj aGUuDQoNCklzICJob3N0IHBhZ2UgY2FjaGUiIG9ubHkgdXNlZCBmb3IgcmVhZC4gYW5kICJxZW11 IGRpc2sgd3JpdGUgY2FjaGUiIHVzZWQgZm9yIHdyaXRpbmcuDQoNCndoaWNoIGNhY2hlIHRoZSBk YXRhIHJlYWNoZWQgZmlyc3Q/IGhvc3QgcGFnZSBjYWNoZSBvciBxZW11IGRpc2sgd3JpdGUgY2Fj aGU/DQoNCg0KDQoNCnh1YW5tYW9fMDAx ------=_001_NextPart421614202388_=---- Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear qemuers:

my qemu-kvm version is 1.0.1

I would like to figure out the qemu disk cache=20 mode. I have visited the qemu-options.hx

there is two cache that I didn't understand: the host cache page= and=20 the qemu disk write cache.

Is "host page cache" only used for read. and "qemu disk write cache" = used=20 for writing.

which cache the data reached first? host page cache or qemu disk writ= e=20 cache?

xuanmao_001

------=_001_NextPart421614202388_=------