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 q39CkEeY122119 for ; Mon, 9 Apr 2012 07:46:14 -0500 Received: from smtp3-g21.free.fr (smtp3-g21.free.fr [212.27.42.3]) by cuda.sgi.com with ESMTP id suYKGWfIXoQ3mASX for ; Mon, 09 Apr 2012 05:46:09 -0700 (PDT) Date: Mon, 9 Apr 2012 14:45:58 +0200 From: Emmanuel Florac Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?) Message-ID: <20120409144558.6072c1eb@galadriel.home> In-Reply-To: <4F827341.2000607@hardwarefreak.com> References: <20350.9643.379841.771496@tree.ty.sabi.co.UK> <20350.13616.901974.523140@tree.ty.sabi.co.UK> <4F7F7C25.8040605@hardwarefreak.com> <20120407104912.44881be3@galadriel.home> <4F81F5FD.1090809@hardwarefreak.com> <20120408234555.695e291f@galadriel.home> <4F827341.2000607@hardwarefreak.com> Mime-Version: 1.0 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: stan@hardwarefreak.com Cc: xfs@oss.sgi.com TGUgTW9uLCAwOSBBcHIgMjAxMiAwMDoyNzoyOSAtMDUwMCB2b3VzIMOpY3JpdmllejoKCj4gSW4g eW91ciBSQUlEMTAgcmFuZG9tIHdyaXRlIHRlc3RpbmcsIHdhcyB0aGlzIHdpdGggYSBmaWxlc3lz dGVtIG9yCj4gZG9pbmcgZGlyZWN0IGJsb2NrIElPPyAKCkRvaW5nIHJhbmRvbSBJTyBpbiBhIGZp bGUgbHlpbmcgb24gYW4gWEZTIGZpbGVzeXN0ZW0uCgo+IElmIHRoZSBsYXR0ZXIsIEkgd29uZGVy IGlmIGl0cyB3cml0ZSBwYXR0ZXJuCj4gaXMgYW55dGhpbmcgbGlrZSB0aGUgYWNjZXNzIHBhdHRl cm4gd2UnZCBzZWUgaGl0dGluZyBkb3plbnMgb2YgQUdzCj4gd2hpbGUgY3JlYXRpbmcgMTBzIG9m IHRob3VzYW5kcyBvZiBmaWxlcy4KCkkgc3VwcG9zZSB0aGUgZmlsZSBjcmVhdGlvbiBwcm9jZXNz IHRvIGhpdCBtb3JlIHNvbWUgZGVmaW5lZCBob3Qgc3BvdHMKdGhhbiBwdXJlIHJhbmRvbSBhY2Nl c3MuCgpJIGp1c3QgaGF2ZSBhIG1hY2hpbmUgZm9yIHRlc3RpbmcgcHVycG9zZXMgd2l0aCAxNSA0 VEIgZHJpdmVzIGluClJBSUQtNiwgbm90IGV4YWN0bHkgYSBJT1BTIGRlbW9uIDopCgpTbyBJJ3Zl IGJ1aWxkIGEgdGFyIGZpbGUgdG8gbWFrZSBpdCBzb21ld2hhdCBzaW1pbGFyIHRvIE9QJ3MKcHJv YmxlbSA6Cgpyb290QDNbcmFpZF0jIGxzIC1saCB0ZXN0LnRhciAKLXJ3LXItLXItLSAxIHJvb3Qg cm9vdCAyLDZHICA5IGF2cmlsIDEzOjUyIHRlc3QudGFyCnJvb3RAM1tyYWlkXSMgdGFyIHRmIHRl c3QudGFyIHwgd2MgLWwKMjM0MzE4CgojIGVjaG8gMyA+IC9wcm9jL3N5cy92bS9kcm9wX2NhY2hl cwojIHRpbWUgdGFyIHhmIHRlc3QudGFyCgpyZWFsICAgIDFtMi41ODRzCnVzZXIgICAgMG0xLjM3 NnMKc3lzICAgICAwbTEzLjY0M3MKCkxldCdzIHJlcnVuIGl0IHdpdGggZmlsZXMgY2FjaGVkICh0 aGUgbWFjaGluZSBoYXMgMTYgR0IgUkFNLCBzbwpldmVyeSBzaW5nbGUgZmlsZSBtdXN0IGJlIGNh Y2hlZCk6CgojIHRpbWUgdGFyIHhmIHRlc3QudGFyCgpyZWFsICAgIDBtNTAuODQycwp1c2VyICAg IDBtMC44MDlzCnN5cyAgICAgMG0xMy43NjdzCgpUeXBpY2FsIElPcyBkdXJpbmcgdW5hcmNoaXZp bmc6IG5vIHJlYWQsIHdyaXRlIElPIGJvdW5kLgoKRGV2aWNlOiAgICAgICAgIHJycW0vcyAgIHdy cW0vcyAgICAgci9zICAgICB3L3MgICAgck1CL3MgICAgd01CL3MgYXZncnEtc3ogYXZncXUtc3og ICBhd2FpdCAgc3ZjdG0gICV1dGlsCnNkYSAgICAgICAgICAgICAgIDAsMDAgIDE1NzMsNTAgICAg MCwwMCAgNDgwLDUwICAgICAwLDAwICAgIDM2LDk2ICAgMTU3LDUyICAgIDYwLDY1ICAxMjQsNDUg ICAyLDA4IDEwMCwxMApkbS0wICAgICAgICAgICAgICAwLDAwICAgICAwLDAwICAgIDAsMDAgMjA2 NywwMCAgICAgMCwwMCAgICAzOSw1NiAgICAzOSwyMCAgIDMyMiw1NSAgMTUxLDYyICAgMCw0OCAx MDAsMTAKClRoZSBPUCBzZXR1cCBiZWluZyA2IDE1ayBkcml2ZXMsIHNob3VsZCBwcm92aWRlIHJv dWdobHkgdGhlIHNhbWUKbnVtYmVyIG9mIHRydWUgSU9QUyAoMTIwMCkgYXMgbXkgc2xvdyBhcyBo ZWxsIGJ1bmNoIG9mIDcyMDBSUE0gCjRUQiBkcml2ZXMgKDE1MDApLiBJIHN1cHBvc2Ugd3JpdGUg Y2FjaGUgbWFrZXMgZm9yIG1vc3Qgb2YKdGhlIGRpZmZlcmVuY2U7IG9yIGVsc2UgMTVLIGRyaXZl cyBhcmUgb3ZlcnJhdGVkIDopCgpBbGFzLCBJIGNhbid0IHJ1biB0aGUgdGVzdCBvbiB0aGlzIG1h Y2hpbmUgd2l0aCBleHQ0OiBJIGNhbid0IApnZXQgbWtmcy5leHQ0IHRvIHN3YWxsb3cgbXkgYmln IGRldmljZS4gCgpta2ZzIC10IGV4dDQgLXYgLWIgNDA5NiAtbiAvZGV2L2RtLTAgMjE0NzQ4MzY0 NwoKc2hvdWxkIHdvcmsgKHRob3VnaCBkcmFzdGljYWxseSBsaW1pdGluZyB0aGUgZmlsZXN5c3Rl bSBzaXplKSwKYnV0IGRpZXMgbWlzZXJhYmx5IHdoZW4gcmVtb3ZpbmcgdGhlIC1uIGZsYWcuIE1t bXBoLCBJIHN1cHBvc2UgaXQncyAKcHJvZHVjdGlvbiByZWFkeSBpZiB5b3UgZG9uJ3QgaGF2ZSBt dWNoIGRhdGEgdG8gc3RvcmUuCgpKRlMgZG9lc24ndCB3b3JrIGVpdGhlci4gQW5kIEkgd2FzIHdv bmRlcmluZyB3aHkgSSdtIHVzaW5nIFhGUz8gIDopCgotLSAKLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tCkVtbWFu dWVsIEZsb3JhYyAgICAgfCAgIERpcmVjdGlvbiB0ZWNobmlxdWUKICAgICAgICAgICAgICAgICAg ICB8ICAgSW50ZWxsaXF1ZQogICAgICAgICAgICAgICAgICAgIHwJPGVmbG9yYWNAaW50ZWxsaXF1 ZS5jb20+CiAgICAgICAgICAgICAgICAgICAgfCAgICszMyAxIDc4IDk0IDg0IDAyCi0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLQoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K eGZzIG1haWxpbmcgbGlzdAp4ZnNAb3NzLnNnaS5jb20KaHR0cDovL29zcy5zZ2kuY29tL21haWxt YW4vbGlzdGluZm8veGZzCg==