From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q37IvfWK055323 for ; Sat, 7 Apr 2012 13:57:41 -0500 Received: from mail.lichtvoll.de (mondschein.lichtvoll.de [194.150.191.11]) by cuda.sgi.com with ESMTP id QW3UnC1qx3vBWWRN for ; Sat, 07 Apr 2012 11:57:39 -0700 (PDT) From: Martin Steigerwald Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?) Date: Sat, 7 Apr 2012 20:57:38 +0200 References: <20120405213740.GA22824@infradead.org> (sfid-20120407_201050_615911_B7F4ADC4) In-Reply-To: MIME-Version: 1.0 Message-Id: <201204072057.38286.Martin@lichtvoll.de> 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: xfs@oss.sgi.com Cc: Stefan Ring , Christoph Hellwig QW0gRnJlaXRhZywgNi4gQXByaWwgMjAxMiBzY2hyaWViIFN0ZWZhbiBSaW5nOgo+ID4gdGhhbmtz IGZvciB0aGUgZGV0YWlsZWQgcmVwb3J0Lgo+IAo+IFRoYW5rcyBmb3IgdGhlIGRldGFpbGVkIGFu ZCBraW5kIGFuc3dlci4KPiAKPiA+IENhbiB5b3UgdHJ5IGEgZmV3IG1vdW50IG9wdGlvbnMgZm9y IG1lIGJvdGggYWxsIHRvZ2V0aGVyIGFuZCBpZiB5b3UKPiA+IGhhdmUgc29tZSB0aW1lIGFsc28g aW5kaXZpZHVhbGx5Lgo+ID4gCj4gPiAgLW8gaW5vZGU2NAo+ID4gCj4gPiAgICAgICAgVGhpcyBh bGxvd3MgaW5vZGVzIHRvIGJlIGNsb3NlIHRvIGRhdGEgZXZlbiBmb3IgPjFUQgo+ID4gICAgICAg IGZpbGVzeXN0ZW1zLiAgSXQncyBzb21ldGhpbmcgd2UgaG9wZSB0byBtYWtlIHRoZSBkZWZhdWx0 IHNvb24uCj4gCj4gVGhlIGZpbGVzeXN0ZW0gaXMgbm90IHRoYXQgbGFyZ2UuIEl04oCZcyBvbmx5 IDQwMEdCLiBJIHR1cm5lZCBpdCBvbgo+IGFueXdheS4gTm8gZGlmZmVyZW5jZS4KPiAKPiA+ICAt byBmaWxlc3RyZWFtcwo+ID4gCj4gPiAgICAgICAgVGhpcyBrZWVwcyBkYXRhIHdyaXR0ZW4gaW4g YSBzaW5nbGUgZGlyZWN0b3J5IGdyb3VwIHRvZ2V0aGVyLgo+ID4gICAgICAgIE5vdCBzdXJlIHlv dXIgZGlyZWN0b3JpZXMgYXJlIGxhcmdlIGVub3VnaCB0byByZWFsbHkgYmVuZWZpdAo+ID4gICAg ICAgIGZyb20gaXQsIGJ1dCBpdCdzIHdvcnRoIGEgdHJ5Lgo+ID4gIC1vIGFsbG9jc2l6ZT00awo+ ID4gCj4gPiAgICAgICAgVGhpcyBkaXNhYmxlcyB0aGUgYWdyZXNzaXZlIGZpbGUgcHJlYWxsb2Nh dGlvbiB3ZSBkbyBpbiBYRlMsCj4gPiAgICAgICAgd2hpY2ggc291bmRzIGxpa2UgaXQncyBub3Qg dXNlZnVsIGZvciB5b3VyIHdvcmtsb2FkLgo+IAo+IGlub2RlNjQrZmlsZXN0cmVhbXM6IG5vIGRp ZmZlcmVuY2UKPiBpbm9kZTY0K2FsbG9jc2l6ZTogbm8gZGlmZmVyZW5jZQo+IGlub2RlNjQrZmls ZXN0cmVhbXMrYWxsb2NzaXplOiBubyBkaWZmZXJlbmNlIDooCj4gCj4gPiBGb3IgbWV0YWRhdGEg aW50ZW5zaXZlIHdvcmtsb2FkcyBsaWtlIHlvdXJzIHlvdSB3b3VsZCBiZSBtdWNoIGJldHRlcgo+ ID4gdXNpbmcgYSBub24tc3RyaXBpbmcgcmFpZCwgZS5nLiBjb25jYXRlbnRhdGlvbiBhbmQgbWly cm9yaW5nIGluc3RlYWQKPiA+IG9mIHJhaWQgNSBvciByYWlkIDYuICBJIGtub3cgdGhpcyBoYXMg YSBjb3N0IGluIHRlcm1zIG9mICJ3YXN0ZWQiCj4gPiBzcGFjZSwgYnV0IGZvciBJT1BzIGJvdW5k IHdvcmtsb2FkIHRoZSBkaWZmZXJlbmNlIGlzIGRyYW1hdGljLgo+IAo+IEhtbSwgSeKAmW0gc3Vy ZSB5b3XigJlyZSByaWdodCwgYnV0IEnigJltIG91dCBvZiBsdWNrIGhlcmUuIElmIEkgaGFkIDI0 Cj4gZHJpdmVzLCBJIGNvdWxkIHRoaW5rIGFib3V0IGEgZGlmZmVyZW50IG9yZ2FuaXphdGlvbi4g QnV0IHdpdGggb25seSA2Cj4gYmF5cywgSSBjYW5ub3QgZ2l2ZSB1cCBhbGwgdGhhdCBzcGFjZS4K PiAKPiBBbHRob3VnaCAqaW4gdGhlb3J5KiwgaXQgKnNob3VsZCogYmUgcG9zc2libGUgdG8gcnVu IGZhc3QgZm9yCj4gd3JpdGUtb25seSB3b3JrbG9hZHMuIFRoZSBzdHJpcGUgc2l6ZSBpcyA2NCBL QiAoNHgxNiksIGFuZCBpdOKAmXMgbm90Cj4gbGlrZSBkYXRhIGlzIHdyaXR0ZW4gYWxsIG92ZXIg dGhlIHBsYWNlLiBTbyBpdCBzaG91bGQgdmVyeSB3ZWxsIGJlCj4gcG9zc2libGUgdG8gd3JpdGUg dGhlIGRhdGEgb3V0IGluIHNvbWUgcmVhc29uYWJseSBzaXplZCBhbmQgYWxpZ25lZAo+IGNodW5r cy4gVGhlIGZpbGVzeXN0ZW0gcGFydGl0aW9uIGl0c2VsZiBpcyBuaWNlbHkgYWxpZ25lZC4KCkFu ZCBpcyBYRlMgYWxpZ25lZCB0byB0aGUgUkFJRCA2PwoKV2hhdCBkb2VzIHhmc19pbmZvIGRpc3Bs YXkgb24gaXQ/CgotLSAKTWFydGluICdIZWxpb3MnIFN0ZWlnZXJ3YWxkIC0gaHR0cDovL3d3dy5M aWNodHZvbGwuZGUKR1BHOiAwM0IwIDBENkMgMDA0MCAwNzEwIDRBRkEgIEI4MkYgOTkxQiBFQUFD IEE1OTkgODRDNwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KeGZzIG1haWxpbmcgbGlzdAp4ZnNAb3NzLnNnaS5jb20KaHR0cDovL29zcy5zZ2kuY29tL21h aWxtYW4vbGlzdGluZm8veGZzCg==