From mboxrd@z Thu Jan 1 00:00:00 1970 From: kedacomkernel Subject: Re: Re: O_DIRECT to md raid 6 is slow Date: Wed, 15 Aug 2012 09:23:38 +0800 Message-ID: <201208150923354686934@gmail.com> References: <201208150906343285670@gmail.com>, Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Andy Lutomirski Cc: linux-kernel , linux-raid List-Id: linux-raid.ids T24gMjAxMi0wOC0xNSAwOToxMiBBbmR5IEx1dG9taXJza2kgPGx1dG9AYW1hY2FwaXRhbC5uZXQ+ IFdyb3RlOg0KPlVidW50dSdzIDMuMi4wLTI3LWdlbmVyaWMuICBJIGNhbiB0ZXN0IG9uIGEgbmV3 ZXIga2VybmVsIHRvbW9ycm93Lg0KSSBndWVzcyBtYXliZSBtaXNzIHRoZSBibGtfcGx1ZyBmdW5j dGlvbi4NCkNhbiB5b3UgYWRkIHRoaXMgcGF0Y2ggYW5kIHJldGVzdC4NCg0KTW92ZSB1bnBsdWdn aW5nIGZvciBkaXJlY3QgSS9PIGZyb20gYXJvdW5kIC0+ZGlyZWN0X0lPKCkgZG93biB0bw0KZG9f YmxvY2tkZXZfZGlyZWN0X0lPKCkuIFRoaXMgaW1wbGljaXRseSBhZGRzIHBsdWdnaW5nIGZvciBk aXJlY3QNCndyaXRlcy4NCiANCkNDOiBMaSBTaGFvaHVhIDxzaGxpQGZ1c2lvbmlvLmNvbT4NCkFj a2VkLWJ5OiBKZWZmIE1veWVyIDxqbW95ZXJAcmVkaGF0LmNvbT4NClNpZ25lZC1vZmYtYnk6IFd1 IEZlbmdndWFuZyA8ZmVuZ2d1YW5nLnd1QGludGVsLmNvbT4NCi0tLQ0KIGZzL2RpcmVjdC1pby5j IHwgICAgNSArKysrKw0KIG1tL2ZpbGVtYXAuYyAgIHwgICAgNCAtLS0tDQogMiBmaWxlcyBjaGFu Z2VkLCA1IGluc2VydGlvbnMoKyksIDQgZGVsZXRpb25zKC0pDQogDQotLS0gbGludXgtbmV4dC5v cmlnL21tL2ZpbGVtYXAuYyAyMDEyLTA4LTA1IDE2OjI0OjQ3Ljg1OTQ2NTEyMiArMDgwMA0KKysr IGxpbnV4LW5leHQvbW0vZmlsZW1hcC5jIDIwMTItMDgtMDUgMTY6MjQ6NDguNDA3NDY1MTM1ICsw ODAwDQpAQCAtMTQxMiwxMiArMTQxMiw4IEBAIGdlbmVyaWNfZmlsZV9haW9fcmVhZChzdHJ1Y3Qg a2lvY2IgKmlvY2INCiAgcmV0dmFsID0gZmlsZW1hcF93cml0ZV9hbmRfd2FpdF9yYW5nZShtYXBw aW5nLCBwb3MsDQogIHBvcyArIGlvdl9sZW5ndGgoaW92LCBucl9zZWdzKSAtIDEpOw0KICBpZiAo IXJldHZhbCkgew0KLSBzdHJ1Y3QgYmxrX3BsdWcgcGx1ZzsNCi0NCi0gYmxrX3N0YXJ0X3BsdWco JnBsdWcpOw0KICByZXR2YWwgPSBtYXBwaW5nLT5hX29wcy0+ZGlyZWN0X0lPKFJFQUQsIGlvY2Is DQogIGlvdiwgcG9zLCBucl9zZWdzKTsNCi0gYmxrX2ZpbmlzaF9wbHVnKCZwbHVnKTsNCiAgfQ0K ICBpZiAocmV0dmFsID4gMCkgew0KICAqcHBvcyA9IHBvcyArIHJldHZhbDsNCi0tLSBsaW51eC1u ZXh0Lm9yaWcvZnMvZGlyZWN0LWlvLmMgMjAxMi0wNy0wNyAyMTo0NjozOS41MzE1MDgxOTggKzA4 MDANCisrKyBsaW51eC1uZXh0L2ZzL2RpcmVjdC1pby5jIDIwMTItMDgtMDUgMTY6MjQ6NDguNDEx NDY1MTM2ICswODAwDQpAQCAtMTA2Miw2ICsxMDYyLDcgQEAgZG9fYmxvY2tkZXZfZGlyZWN0X0lP KGludCBydywgc3RydWN0IGtpbw0KICB1bnNpZ25lZCBsb25nIHVzZXJfYWRkcjsNCiAgc2l6ZV90 IGJ5dGVzOw0KICBzdHJ1Y3QgYnVmZmVyX2hlYWQgbWFwX2JoID0geyAwLCB9Ow0KKyBzdHJ1Y3Qg YmxrX3BsdWcgcGx1ZzsNCiANCiAgaWYgKHJ3ICYgV1JJVEUpDQogIHJ3ID0gV1JJVEVfT0RJUkVD VDsNCkBAIC0xMTc3LDYgKzExNzgsOCBAQCBkb19ibG9ja2Rldl9kaXJlY3RfSU8oaW50IHJ3LCBz dHJ1Y3Qga2lvDQogIFBBR0VfU0laRSAtIHVzZXJfYWRkciAvIFBBR0VfU0laRSk7DQogIH0NCiAN CisgYmxrX3N0YXJ0X3BsdWcoJnBsdWcpOw0KKw0KICBmb3IgKHNlZyA9IDA7IHNlZyA8IG5yX3Nl Z3M7IHNlZysrKSB7DQogIHVzZXJfYWRkciA9ICh1bnNpZ25lZCBsb25nKWlvdltzZWddLmlvdl9i YXNlOw0KICBzZGlvLnNpemUgKz0gYnl0ZXMgPSBpb3Zbc2VnXS5pb3ZfbGVuOw0KQEAgLTEyMzUs NiArMTIzOCw4IEBAIGRvX2Jsb2NrZGV2X2RpcmVjdF9JTyhpbnQgcncsIHN0cnVjdCBraW8NCiAg aWYgKHNkaW8uYmlvKQ0KICBkaW9fYmlvX3N1Ym1pdChkaW8sICZzZGlvKTsNCiANCisgYmxrX2Zp bmlzaF9wbHVnKCZwbHVnKTsNCisNCiAgLyoNCiAgICogSXQgaXMgcG9zc2libGUgdGhhdCwgd2Ug cmV0dXJuIHNob3J0IElPIGR1ZSB0byBlbmQgb2YgZmlsZS4NCiAgICogSW4gdGhhdCBjYXNlLCB3 ZSBuZWVkIHRvIHJlbGVhc2UgYWxsIHRoZSBwYWdlcyB3ZSBnb3QgaG9sZCBvbi4NCiANCiANCi0t DQo=