From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q390Jm0O236824 for ; Sun, 8 Apr 2012 19:19:48 -0500 Received: from ipmail06.adl6.internode.on.net (ipmail06.adl6.internode.on.net [150.101.137.145]) by cuda.sgi.com with ESMTP id BhoK1wn6iIR7FdOK for ; Sun, 08 Apr 2012 17:19:46 -0700 (PDT) Date: Mon, 9 Apr 2012 10:19:43 +1000 From: Dave Chinner Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?) Message-ID: <20120409001943.GI18323@dastard> References: <20350.9643.379841.771496@tree.ty.sabi.co.UK> <20350.13616.901974.523140@tree.ty.sabi.co.UK> <4F7F7C25.8040605@hardwarefreak.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Stefan Ring Cc: stan@hardwarefreak.com, Linux fs XFS T24gU2F0LCBBcHIgMDcsIDIwMTIgYXQgMDk6Mjc6NTBBTSArMDIwMCwgU3RlZmFuIFJpbmcgd3Jv dGU6Cj4gPiBJbnN0ZWFkLCBhIGZhciBtb3JlIG9wdGltYWwgc29sdXRpb24gd291bGQgYmUgdG8g c2V0IGFzaWRlIDQgc3BhcmVzIHBlcgo+ID4gY2hhc3NpcyBhbmQgY3JlYXRlIDE0IGZvdXIgZHJp dmUgUkFESTEwIGFycmF5cy4gwqBUaGlzIHdvdWxkIHlpZWxkIH42MDAKPiA+IHNlZWtzL3NlYyBh bmQgfjQwME1CL3Mgc2VxdWVudGlhbCB0aHJvdWdocHV0IHBlcmZvcm1hbmNlIHBlciAyIHNwaW5k bGUKPiA+IGFycmF5LiDCoFdlJ2Qgc3RpdGNoIHRoZSByZXN1bHRpbmcgNTYgaGFyZHdhcmUgUkFJ RDEwIGFycmF5cyB0b2dldGhlciBpbgo+ID4gYW4gbWRyYWlkIGxpbmVhciAoY29uY2F0ZW5hdGVk KSBhcnJheS4gwqBUaGVuIHdlJ2QgZm9ybWF0IHRoaXMgMTEyCj4gPiBlZmZlY3RpdmUgc3BpbmRs ZSBsaW5lYXIgYXJyYXkgd2l0aCBzaW1wbHk6Cj4gPgo+ID4gJCBta2ZzLnhmcyAtZCBhZ2NvdW50 PTU2IC9kZXYvbWQwCj4gPgo+ID4gU2luY2UgZWFjaCBSQUlEMTAgaXMgOTAwR0IgY2FwYWNpdHks IHdlIGhhdmUgNTYgQUdzIG9mIGp1c3QgdW5kZXIgdGhlCj4gPiAxVEIgbGltaXQsIDEgQUcgcGVy IDIgcGh5c2ljYWwgc3BpbmRsZXMuIMKgRHVlIHRvIHRoZSAyIHN0cmlwZSBzcGluZGxlCj4gPiBu YXR1cmUgb2YgdGhlIGNvbnN0aXR1ZW50IGhhcmR3YXJlIFJBSUQxMCBhcnJheXMsIHdlIGRvbid0 IG5lZWQgdG8gd29ycnkKPiA+IGFib3V0IGFsaWduaW5nIFhGUyB3cml0ZXMgdG8gdGhlIFJBSUQg c3RyaXBlIHdpZHRoLiDCoFRoZSBoYXJkd2FyZSBjYWNoZQo+ID4gd2lsbCB0YWtlIGNhcmUgb2Yg ZmlsbGluZyB0aGUgc21hbGwgc3RyaXBlcy4gwqBOb3cgd2UncmUgaW4gdGhlIG9wcG9zaXRlCj4g PiBzaXR1YXRpb24gb2YgaGF2aW5nIHRvbyBtYW55IEFHcyBwZXIgc3BpbmRsZS4gwqBXZSd2ZSBw dXQgMiBzcGluZGxlcyBpbiBhCj4gPiBzaW5nbGUgQUcgYW5kIHR1cm5lZCB0aGUgc2VlayBzdGFy dmF0aW9uIGlzc3VlcyBvbiBpdHMgaGVhZC4KPiAKPiBTbyBpdCBzb3VuZHMgbGlrZSB0aGF0IGZv ciBwb29yIGd1eXMgbGlrZSB1cywgd2hvIGNhbuKAmXQgYWZmb3JkIHRoZQo+IGhhcmR3YXJlIHRv IGhhdmUgZG96ZW5zIG9mIHNwaW5kbGVzLCB0aGUgYmVzdCBvcHRpb24gd291bGQgYmUgdG8KPiBj cmVhdGUgdGhlIFhGUyBmaWxlIHN5c3RlbSB3aXRoIGFnY291bnQ9MT8KCk5vLCBiZWNhdXNlIHRo ZW4geW91IGhhdmUgbm8gcmVkdW5kYW5jeSBpbiBtZXRhZGF0YSBzdHJ1Y3R1cmVzLCBzbwppZiB5 b3UgbG9zZS9jb3JydXB0IHRoZSBzdXBlcmJsb2NrIHlvdSBjYW4gZWFzaWVyIGxvc2UgdGhlIGVu dGlyZQpmaWxlc3l0ZW0uICBOb3QgdG8gbWVudGlvbiB5b3UgaGF2ZSBubyBhbGxvY2F0aW9uIHBh cmFsbGVsaXNtIGluIHRoZQpmaWxlc3lzdGVtLCBzbyB5b3UnbGwgZ2V0IHRlcnJpYmxlIHBlcmZv cm1hbmNlIGluIG1hbnkgY29tbW9uCndvcmtsb2Fkcy4gSU8gZmFpcm5lc3Mgd2lsbCBhbHNvIGJl IGEgYmlnIHByb2JsZW0uCgo+IFRoYXQgc2VlbXMgdG8gYmUgdGhlIG9ubHkgcmVhc29uYWJsZSBj b25jbHVzaW9uIHRvIG1lLCBzaW5jZSBhCj4gc2luZ2xlIFJBSUQgZGV2aWNlLCBsaWtlIGEgc2lu Z2xlIGRpc2ssIGNhbm5vdCB3cml0ZSBpbiBwYXJhbGxlbAo+IGFueXdheS4KCkEgZGVjZW50IFJB SUQgY29udHJvbGxlciB3aXRoIGEgQkJXQyBhbmQgYSBzaW5nbGUgTFVOIGJlbmVmaXRzIGZyb20K cGFyYWxsZWxpc20ganVzdCBhcyBtdWNoIGFzIGEgbGFyZ2UgZGlzayBhcnJheXMgZG8gYmVjYXVz ZSB0aGUgQkJXQwptaW5pbWlzZXMgdGhlIHdyaXRlIElPIGxhdGVuY3kgYW5kIHRoZSBjb250cm9s bGVyIHRvIGRvIGEgYmV0dGVyIGpvYgpvZiBzY2hlZHVsaW5nIGl0J3MgSU8uCgpDaGVlcnMsCgpE YXZlLgotLSAKRGF2ZSBDaGlubmVyCmRhdmlkQGZyb21vcmJpdC5jb20KCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCnhmcyBtYWlsaW5nIGxpc3QKeGZzQG9z cy5zZ2kuY29tCmh0dHA6Ly9vc3Muc2dpLmNvbS9tYWlsbWFuL2xpc3RpbmZvL3hmcwo=