From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q0PMtdpT082016 for ; Wed, 25 Jan 2012 16:55:39 -0600 Received: from ipmail04.adl6.internode.on.net (ipmail04.adl6.internode.on.net [150.101.137.141]) by cuda.sgi.com with ESMTP id pGfeAhsE7cyAIU1V for ; Wed, 25 Jan 2012 14:55:37 -0800 (PST) Date: Thu, 26 Jan 2012 09:55:35 +1100 From: Dave Chinner Subject: Re: Does Ext4 support parallel write similar to XFS? Message-ID: <20120125225535.GU15102@dastard> References: <4F202F2E.9000608@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4F202F2E.9000608@redhat.com> 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: Eric Sandeen Cc: Amit Sahrawat , LKML , xfs@oss.sgi.com, Christoph Hellwig , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org T24gV2VkLCBKYW4gMjUsIDIwMTIgYXQgMTA6MzQ6NTRBTSAtMDYwMCwgRXJpYyBTYW5kZWVuIHdy b3RlOgo+IE9uIDEvMjQvMTIgMTE6MTkgUE0sIEFtaXQgU2FocmF3YXQgd3JvdGU6Cj4gPiBJbiBY RlMgd2UgY2FuIHdyaXRlIHBhcmFsbGVsIChpLixlIHdlIGNhbiBtYWtlIHVzZSBvZiBhbGxvY2F0 aW9uCj4gPiBncm91cHMgZm9yIHdyaXRpbmcgcHJvY2VzcykuIElmIHRoZSBmaWxlcyBhcmUga2Vw dCBpbiBpbmRpdmlkdWFsCj4gPiBkaXJlY3RvcmllcywgdGhlcmUgaXMgYSBwb3NzaWJpbGl0eSB0 aGF0IGZpcnN0IHRoZSBibG9ja3MgZm9yIHRoYXQKPiA+IGZpbGVzIGJlIHVzZWQgZnJvbSBpbmRp dmlkdWFsIGFsbG9jYXRpb24gZ3JvdXBzLiBJZiBJIHN0YXJ0IOKAmDTigJkKPiA+IHdyaXRpbmcg cHJvY2VzcyhjcCAxMDBNQl9maWxlIC88ZGlybnVtPi8pIOKAkyBhZnRlciB3cml0aW5nIGlzIGZp bmlzaGVkCj4gPiDigJMgaWYgSSBjaGVjayB0aGUgYm1hcCDigJMgaXQgZG9lcyBzaG93cyB0aGF0 IGluaXRpYWwgYWxsb2NhdGlvbiB3YXMgZnJvbQo+ID4gaW5kaXZpZHVhbCBhbGxvY2F0aW9uIGdy b3Vwcy4KPiA+IEV2ZW4gdGhvdWdoIGluIEV4dDQgYWxzbyB3ZSBkbyBoYXZlIGdyb3VwcyDigJMg YnV0IEkgYW0gbm90IGFibGUgdG8gZ2V0Cj4gPiBiZWhhdmlvciBzaW1pbGFyIHRvIFhGUy4KPiA+ IElmIEkgY2hlY2sgdGhlIGZpbGUgZXh0ZW50cyDigJMgdGhlIGV4dGVudHMgYXJlIGluIG1peGVk IGZvcm0sIHRoZQo+ID4gYWxsb2NhdGlvbiBwYXR0ZXJuIGlzIGFsc28gdmVyeSBmcmFnbWVudGVk Lgo+ID4gCj4gPiBQbGVhc2Ugc2hhcmUgbW9yZSBvbiB0aGlzLiBBbHNvLCBpZiB0aGVyZSBpcyBh IHBvc3NpYmxlIGV4YWN0IHRlc3QKPiA+IGNhc2UgdG8gY2hlY2sgZm9yIHBhcmFsbGVsIHdyaXRl cyBzdXBwb3J0Lgo+IAo+IEl0IHNlZW1zIHRoYXQgeW91IGFyZSBhc2tpbmcgbW9yZSBhYm91dCBh bGxvY2F0aW9uIHBvbGljeSB0aGFuIHBhcmFsbGVsaXNtCj4gaW4gZ2VuZXJhbD8gIFdpdGggZWl0 aGVyIGZpbGVzeXN0ZW0sIHlvdSBjb3VsZCB1c2UgcHJlYWxsb2NhdGlvbiB0byB3aW5kCj4gdXAg d2l0aCBtb3JlIGNvbnRpZ3VvdXMgZmlsZXMgd2hlbiB5b3Ugd3JpdGUgdGhlbSBpbiBwYXJhbGxl bCwgdGhvdWdoCj4gdGhhdCByZXF1aXJlcyBzb21lIGlkZWEgb2YgdGhlIGZpbGUgc2l6ZSBhaGVh ZCBvZiB0aW1lLgo+IAo+IGV4dDQgZG9lc24ndCBoYXZlIHRoYXQgZXhhY3QgZGlyOjpncm91cCBo ZXVyaXN0aWMgdGhhdCB4ZnMgdXNlcywKPiBidXQgaXQgZG9lcyBoYXZlIG90aGVyIG1lY2hhbmlz bXMgYW5kIGhldXJpc3RpY3MgdG8gdHJ5IHRvIGdldCBnb29kCj4gZmlsZSBhbmQgZGlyZWN0b3J5 IGxheW91dC4KClhGcyBoYXMgZGlmZmVyZW50IGFsbG9jYXRpb24gcG9saWNpZXMgYWNjb3JkaW5n IHRvIG1vdW50IG9wdGlvbnMKdXNlZC4gIGlub2RlMzIgKGRlZmF1bHQgZm9yID4gMVRCKSwgaW5v ZGU2NCAoZGVmYXVsdCBmb3IgPDFUQikgYW5kCmZpbGVzdHJlYW1zLiBFYWNoIHdpbGwgZ2l2ZSB5 b3UgZGlmZmVyZW50IGxheW91dHMgZm9yIHRoZSBzYW1lIHRlc3QKZGVwZW5kaW5nIG9uIHRoZSBz aXplIG9mIHlvdXIgZmlsZXN5c3RlbSBhbmQgdGhlIGFtb3VudCBvZiBmcmVlCnNwYWNlIHlvdSBo YXZlIGF2YWlsYWJsZSBpbiBpdC4KCklmIFhGUyBkb2VzIHdoYXQgeW91IHdhbnQsIHRoZW4gdXNl IGl0LiBUaGVyZSBpcyBubyBnb29kIHJlYXNvbiBmb3IKdHJ5aW5nIHRvIG1ha2UgZXh0NCBkbyBl dmVyeXRoaW5nIFhGUyBkb2VzIGJlY2F1c2UgaXQgc2ltcGx5IGNhbid0LgpFc3BlY2lhbGx5IHdo ZW4gaXQgY29tZXMgdG8gYWxsb2NhdGlvbiBzdHJhdGVnaWVzIGFuZCBwb2xpY2llcy4uLgoKQ2hl ZXJzLAoKRGF2ZS4KLS0gCkRhdmUgQ2hpbm5lcgpkYXZpZEBmcm9tb3JiaXQuY29tCgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwp4ZnMgbWFpbGluZyBsaXN0 Cnhmc0Bvc3Muc2dpLmNvbQpodHRwOi8vb3NzLnNnaS5jb20vbWFpbG1hbi9saXN0aW5mby94ZnMK