From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 5E70D7F3F for ; Sat, 21 Dec 2013 06:20:26 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id BF7ECAC001 for ; Sat, 21 Dec 2013 04:20:25 -0800 (PST) Received: from mail-in-03.arcor-online.net (mail-in-03.arcor-online.net [151.189.21.43]) by cuda.sgi.com with ESMTP id tSof5yoLLd4CCWEG (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Sat, 21 Dec 2013 04:20:23 -0800 (PST) Date: Sat, 21 Dec 2013 13:20:14 +0100 From: Piergiorgio Sartor Subject: Re: md-RAID5/6 stripe_cache_size default value vs performance vs memory footprint Message-ID: <20131221122014.GA3909@lazy.lzy> References: <52B102FF.8040404@pzystorm.de> <52B2FE9E.50307@hardwarefreak.com> <52B41B67.9030308@pzystorm.de> <201312202343.47895.arekm@maven.pl> <52B57912.5080000@hardwarefreak.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <52B57912.5080000@hardwarefreak.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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Stan Hoeppner Cc: linux-raid@vger.kernel.org, "xfs@oss.sgi.com" T24gU2F0LCBEZWMgMjEsIDIwMTMgYXQgMDU6MTg6NDJBTSAtMDYwMCwgU3RhbiBIb2VwcG5lciB3 cm90ZToKPiBJIHJlbmFtZWQgdGhlIHN1YmplY3QgYXMgeW91ciBxdWVzdGlvbiBkb2Vzbid0IHJl YWxseSBhcHBseSB0byBYRlMsIG9yCj4gdGhlIE9QLCBidXQgdG8gbWQtUkFJRC4KPiAKPiBPbiAx Mi8yMC8yMDEzIDQ6NDMgUE0sIEFya2FkaXVzeiBNacWba2lld2ljeiB3cm90ZToKPiAKPiA+IEkg d29uZGVyIHdoeSBrZXJuZWwgaXMgZ2l2aW5nIGRlZmF1bHRzIHRoYXQgZXZlcnlvbmUgcmVwZWF0 bHkgcmVjb21tZW5kcyB0byAKPiA+IGNoYW5nZS9pbmNyZWFzZT8gSGFzIGFueW9uZSB0cmllZCB0 byBidWdyZXBvcnQgdGhhdCBmb3Igc3RyaXBlX2NhY2hlX3NpemUgCj4gPiBjYXNlPwo+IAo+IFRo ZSBhbnN3ZXIgaXMgYmFsYW5jaW5nIGRlZmF1bHQgbWQtUkFJRDUvNiB3cml0ZSBwZXJmb3JtYW5j ZSBhZ2FpbnN0Cj4ga2VybmVsIFJBTSBjb25zdW1wdGlvbiwgd2l0aCBtb3JlIHdlaWdodCBnaXZl biB0byB0aGUgbGF0dGVyLiAgVGhlIGZvcm11bGE6Cj4gCj4gKCg0MDk2KnN0cmlwZV9jYWNoZV9z aXplKSpudW1fZHJpdmVzKT0gUkFNIGNvbnN1bWVkIGZvciBzdHJpcGUgY2FjaGUKPiAKPiBIaWdo IHN0cmlwZV9jYWNoZV9zaXplIHZhbHVlcyB3aWxsIGNhdXNlIHRoZSBrZXJuZWwgdG8gZWF0IG5v biB0cml2aWFsCj4gYW1vdW50cyBvZiBSQU0gZm9yIHRoZSBzdHJpcGUgY2FjaGUgYnVmZmVyLiAg VGhpcyB0YWJsZSBkZW1vbnN0cmF0ZXMgdGhlCj4gZWZmZWN0IHRvZGF5IGZvciB0eXBpY2FsIFJB SUQ1LzYgZGlzayBjb3VudHMuCj4gCj4gc3RyaXBlX2NhY2hlX3NpemUJZHJpdmVzCVJBTSBjb25z dW1lZAo+IDI1NgkJCSA0CSAgNCBNQgo+IAkJCSA4CSAgOCBNQgo+IAkJCTE2CSAxNiBNQgo+IDUx MgkJCSA0CSAgOCBNQgo+IAkJCSA4CSAxNiBNQgo+IAkJCTE2CSAzMiBNQgo+IDEwMjQJCQkgNAkg MTYgTUIKPiAJCQkgOAkgMzIgTUIKPiAJCQkxNgkgNjQgTUIKPiAyMDQ4CQkJIDQJIDMyIE1CCj4g CQkJIDgJIDY0IE1CCj4gCQkJMTYJMTI4IE1CCj4gNDA5NgkJCSA0CSA2NCBNQgo+IAkJCSA4CTEy OCBNQgo+IAkJCTE2CTI1NiBNQgo+IAo+IFRoZSBwb3dlcnMgdGhhdCBiZSwgTGludXMgaW4gcGFy dGljdWxhciwgYXJlIG5vdCBmb25kIG9mIGRlZmF1bHQKPiBzZXR0aW5ncyB0aGF0IGNyZWF0ZSBh IGxvdCBvZiBrZXJuZWwgbWVtb3J5IHN0cnVjdHVyZXMuICBUaGUgZGVmYXVsdAo+IG1kLVJBSUQ1 LzYgc3RyaXBlX2NhY2hlLXNpemUgeWllbGRzIDFNQiBjb25zdW1lZCBwZXIgbWVtYmVyIGRldmlj ZS4KPiAKPiBXaXRoIFNTRHMgYmVjb21pbmcgbWFpbnN0cmVhbSwgYW5kIGJlY29taW5nIGV2ZXIg ZmFzdGVyLCBhdCBzb21lIHBvaW50Cj4gdGhlIG1kLVJBSUQ1LzYgYXJjaGl0ZWN0dXJlIHdpbGwg aGF2ZSB0byBiZSByZWRlc2lnbmVkIGJlY2F1c2Ugb2YgdGhlCj4gbWVtb3J5IGZvb3RwcmludCBy ZXF1aXJlZCBmb3IgcGVyZm9ybWFuY2UuICBDdXJyZW50bHkgdGhlIHJlcXVpcmVkIHNpemUKPiBv ZiB0aGUgc3RyaXBlIGNhY2hlIGFwcGVhcnMgZGlyZWN0bHkgcHJvcG9ydGlvbmFsIHRvIHRoZSBh Z2dyZWdhdGUgd3JpdGUKPiB0aHJvdWdocHV0IG9mIHRoZSBSQUlEIGRldmljZXMuICBUaHVzIHRo ZSBvcHRpbWFsIHZhbHVlIHdpbGwgdmFyeQo+IGdyZWF0bHkgZnJvbSBvbmUgc3lzdGVtIHRvIGFu b3RoZXIgZGVwZW5kaW5nIG9uIHRoZSB0aHJvdWdocHV0IG9mIHRoZQo+IGRyaXZlcy4KPiAKPiBG b3IgZXhhbXBsZSwgSSBhc3Npc3RlZCBhIHVzZXIgd2l0aCA1eCBJbnRlbCBTU0RzIGJhY2sgaW4g SmFudWFyeSBhbmQKPiBoaXMgc3lzdGVtIHJlcXVpcmVkIDQwOTYsIG9yIDgwTUIgb2YgUkFNIGZv ciBzdHJpcGUgY2FjaGUsIHRvIHJlYWNoCj4gbWF4aW11bSB3cml0ZSB0aHJvdWdocHV0IG9mIHRo ZSBkZXZpY2VzLiAgVGhpcyB5aWVsZGVkIDYwME1CL3Mgb3IgNjAlCj4gZ3JlYXRlciB0aHJvdWdo cHV0IHRoYW4gMjA0OCwgb3IgNDBNQiBSQU0gZm9yIGNhY2hlLiAgSW4gaGlzIGNhc2UgNjBNQgo+ IG1vcmUgUkFNIHRoYW4gdGhlIGRlZmF1bHQgd2FzIHdlbGwgd29ydGggdGhlIGluY3JlYXNlIGFz IHRoZSBtYWNoaW5lIHdhcwo+IGFuIGlTQ1NJIHRhcmdldCBzZXJ2ZXIgd2l0aCA4R0IgUkFNLgo+ IAo+IEluIHRoZSBwcmV2aW91cyBjYXNlIHdpdGggNXggcnVzdCBSQUlENiB0aGUgMjA0OCB2YWx1 ZSBzZWVtZWQgb3B0aW1hbAo+ICh0aG91Z2ggbm90IHlldCB2ZXJpZmllZCksIHJlcXVpcmluZyA0 ME1CIGxlc3MgUkFNIHRoYW4gdGhlIDV4IEludGVsCj4gU1NEcy4gIEZvciBhIDMgbW9kZXJuIHJ1 c3QgUkFJRDUgdGhlIGRlZmF1bHQgb2YgMjU2LCBvciAzTUIsIGlzIGNsb3NlIHRvCj4gb3B0aW1h bCBidXQgbWF5YmUgYSBsaXR0bGUgbG93LiAgQ29uc2lkZXIgdGhhdCAyNTYgaGFzIGJlZW4gdGhl IGRlZmF1bHQKPiBmb3IgYSB2ZXJ5IGxvbmcgdGltZSwgYW5kIHdhcyBzZWxlY3RlZCBiYWNrIHdo ZW4gYXZlcmFnZSBkcml2ZQo+IHRocm91Z2hwdXQgd2FzIG11Y2ggbXVjaCBsb3dlciwgYXMgaW4g NTBNQi9zIG9yIGxlc3MsIFNTRHMgaGFkbid0IHlldAo+IGJlZW4gaW52ZW50ZWQsIGFuZCBzeXN0 ZW0gbWVtb3JpZXMgd2VyZSBtdWNoIHNtYWxsZXIuCj4gCj4gRHVlIHRvIHRoZSBtYXNzaXZlIGRp ZmZlcmVuY2UgaW4gdGhyb3VnaHB1dCBiZXR3ZWVuIHJ1c3QgYW5kIFNTRCwgYW55Cj4gbWVhbmlu Z2Z1bCBjaGFuZ2UgaW4gdGhlIGRlZmF1bHQgcmVhbGx5IHJlcXVpcmVzIG5ldyBjb2RlIHRvIHNu aWZmIG91dAo+IHdoYXQgdHlwZSBvZiBkZXZpY2VzIGNvbnN0aXR1dGUgdGhlIGFycmF5LCBpZiB0 aGF0J3MgcG9zc2libGUsIGFuZCBpdAo+IHByb2JhYmx5IGlzbid0LCBhbmQgc2V0IGEgbG93aXNo IGRlZmF1bHQgYWNjb3JkaW5nbHkuICBBZ2FpbiwgU1NEcwo+IGRpZG4ndCBleGlzdCB3aGVuIG1k LVJBSUQgd2FzIGNvZGVkLCBub3Igd2hlbiB0aGlzIGRlZmF1bHQgd2FzIHNldCwgYW5kCj4gdGhp cyB0aHJvd3MgYSBiaWcgbW9ua2V5IHdyZW5jaCBpbnRvIHRoZXNlIHNwb2tlcy4KCkhpIFN0YW4s CgpuaWNlIGFuYWx5dGljYWwgcmVwb3J0LCBhcyB1c3VhbC4uLgoKTXkgZHVtYiBzdWdnZXN0aW9u IHdvdWxkIGJlIHRvIHNpbXBseSB1c2UgdWRldiB0bwpzZXR1cCB0aGUgZHJpdmVzLgpFdmVyeXRo aW5nLCBzdHJpcGVfY2FjaGUsIHJlYWRfYWhlYWQsIHN0Y2VyciwgZXRjLgpjYW4gYmUgY29uZmln dXJlZCwgSSBzdXBwb3NlLCBieSB1ZGV2IHJ1bGVzLgoKYnllLAoKLS0gCgpwaWVyZ2lvcmdpbwoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KeGZzIG1haWxp bmcgbGlzdAp4ZnNAb3NzLnNnaS5jb20KaHR0cDovL29zcy5zZ2kuY29tL21haWxtYW4vbGlzdGlu Zm8veGZzCg==