From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 562A47F37 for ; Mon, 14 Dec 2015 02:39:06 -0600 (CST) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay1.corp.sgi.com (Postfix) with ESMTP id 2853E8F804B for ; Mon, 14 Dec 2015 00:39:02 -0800 (PST) Received: from mail.lichtvoll.de (mondschein.lichtvoll.de [194.150.191.11]) by cuda.sgi.com with ESMTP id cnYIJ5vImAqBvDJX for ; Mon, 14 Dec 2015 00:38:58 -0800 (PST) From: Martin Steigerwald Subject: Re: XFS and nobarrier with SSDs Date: Mon, 14 Dec 2015 09:38:56 +0100 Message-ID: <3911767.qVqsL1TcMv@merkaba> In-Reply-To: <566E6524.6070401@xortex.com> References: <3496214.YTSKClH6pV@merkaba> <566E6524.6070401@xortex.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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Georg =?ISO-8859-1?Q?Sch=F6nberger?= , Jens Axboe , Jeff Moyer , Linux FS-Devel , Linux Block mailing list Cc: XFS mailing list SGVsbG8gR2VvcmcuCgpJIGFtIGFkZGluZyBpbiBzb21lIENjcyBvZiBrZXJuZWwgZGV2cyBhbmQg bWFpbGluZyBsaXN0cywgYXMgSSB0aGluayB0aGlzIGlzIGEgCm1vcmUgZ2VuZXJpYyBxdWVzdGlv bi4gU3RpbGwgb2YgY291cnNlIHdvdWxkIGJlIG5pY2UgdG8gaGVhciBzb21ldGhpbmcgZnJvbSAK WEZTIGRldmVsb3BlcnMgYXMgd2VsbC4KCkZvciB0aGUgYnJvYWRlciBhdWRpZW5jZSB0aGUgcXVl c3Rpb24gaXM6CgpJcyBpdCBzYWZlIHRvIHVzZSBYRlMgKG9yIGFueSBvdGhlciBmaWxlc3lzdGVt KSBvbiBlbnRlcnByaXNlIFNTRHMgd2l0aCBQb3dlciAKTG9zcyBQcm90ZWN0aW9uIChQTFApLCBp LmUuIHNvbWUgY2FwYWNpdG9yIHRvIHByb3ZpZGUgZm9yIGVub3VnaCBlbGVjdHJpY2l0eSAKdG8g d3JpdGUgb3V0IGFsbCBkYXRhIGluIERSQU0gdG8gZmxhc2ggYWZ0ZXIgYSBwb3dlciBsb3NzLCB3 aXRoIGEgcmVvcmRlcmluZyAKSS9PIHNjaGVkdWxlciBsaWtlIENGUT8KCkFjY29yZGluZyB0byB0 aGlzIGNvbW1lbnQgb2YgSmVmZiBNb3llciBvbiBhIHJlcG9ydCBvbiBSZWRIYXTCtHMgYnVnemls bGEgdGhlIApJL08gc2NoZWR1bGVyIGNhbm5vdCByZW9yZGVyIGNvbW1pdCBibG9jayBhbmQgbG9n IGVudHJ5LCBzbyBpdCB3b3VsZCBiZSBzYWZlLCAKSSB0aGluayAoc2VlIGJlbG93KS4KCkFtIE1v bnRhZywgMTQuIERlemVtYmVyIDIwMTUsIDA2OjQzOjQ4IENFVCBzY2hyaWViIEdlb3JnIFNjaMO2 bmJlcmdlcjoKPiBPbiAyMDE1LTEyLTEyIDEzOjI2LCBNYXJ0aW4gU3RlaWdlcndhbGQgd3JvdGU6 Cj4gPiBBbSBTYW1zdGFnLCAxMi4gRGV6ZW1iZXIgMjAxNSwgMTA6MjQ6MjUgQ0VUIHNjaHJpZWIg R2VvcmcgU2Now7ZuYmVyZ2VyOgo+ID4+IFdlIGFyZSB1c2luZyBhIGxvdCBvZiBTU0RzIGluIG91 ciBDZXBoIGNsdXN0ZXJzIHdpdGggWEZTLiBPdXIgU1NEcyBoYXZlCj4gPj4gUG93ZXIgTG9zcyBQ cm90ZWN0aW9uIHZpYSBjYXBhY2l0b3JzLCBzbyBpcyBpdCBzYWZlIGluIGFsbCBjYXNlcyB0byBy dW4KPiA+PiBYRlMKPiA+PiB3aXRoIG5vYmFycmllciBvbiB0aGVtPyBPciBpcyB0aGVyZSBpbmRl ZWQgYSBuZWVkIGZvciBhIHNwZWNpZmljIEkvTwo+ID4+IHNjaGVkdWxlcj8KPiA+IAo+ID4gSSBk byB0aGluayB0aGF0IHVzaW5nIG5vYmFycmllciB3b3VsZCBiZSBzYWZlIHdpdGggdGhvc2UgU1NE cyBhcyBsb25nIGFzCj4gPiB0aGVyZSBpcyBubyBvdGhlciBjYWNoaW5nIGhhcHBlbmluZyBvbiB0 aGUgaGFyZHdhcmUgc2lkZSwgZm9yIGV4YW1wbGUKPiA+IGluc2lkZSB0aGUgY29udHJvbGxlciB0 aGF0IHRhbGtzIHRvIHRoZSBTU0RzLgpb4oCmXQo+IFdlIGFyZSB1c2luZyBIQkFzIGFuZCBubyBS QUlEIGNvbnRyb2xsZXIsIHRoZXJlZm9yZSB0aGVyZSBpcyBubyBvdGhlcgo+IGNhY2hlIGluIHRo ZSBJL08gc3RhY2suCj4gCj4gPiBJIGFsd2F5cyB0aG91Z2h0IGJhcnJpZXIvbm9iYXJyaWVyIGFj dHMgaW5kZXBlbmRlbnRseSBvZiB0aGUgSS9PIHNjaGVkdWxlcgo+ID4gdGhpbmcsIGJ1dCBJIGNh biB1bmRlcnN0YW5kIHRoZSB0aG91Z2h0IGZyb20gdGhlIGJ1ZyByZXBvcnQgeW91IGxpbmtlZCB0 bwo+ID4gYmVsb3cuIEFzIGZvciBJL08gc2NoZWR1bGVycywgd2l0aCByZWNlbnQga2VybmVscyBh bmQgYmxvY2sgbXVsdGlxdWV1ZSBJCj4gPiBzZWUgaXQgYmVpbmcgc2V0IHRvICJub25lIi4KPiAK PiBXaGF0IGRvIHlvdSBtZWFuIGJ5ICJub25lIiBuZWFyPyBEbyB5b3UgdGhpbmsgSSB3aWxsIGJl IG1vcmUgb24gdGhlIHNhZmUKPiBzaWRlIHdpdGggbm9vcCBzY2hlZHVsZXI/CgpJIG1lYW4gdGhh dCBJIGdldCB0aGlzIG9uIGEgNC4zIGtlcm5lbCB3aXRoIGJsay1tcSBlbmFibGVkOgoKbWVya2Fi YTovc3lzL2Jsb2NrL3NkYS9xdWV1ZT4gZ3JlcCAuIHJvdGF0aW9uYWwgc2NoZWR1bGVyIApyb3Rh dGlvbmFsOjAKc2NoZWR1bGVyOm5vbmUKCm1lcmthYmE6L3N5cy9ibG9jay9zZGEvcXVldWU+IGVj aG8gImNmcSIgPiBzY2hlZHVsZXIgCm1lcmthYmE6L3N5cy9ibG9jay9zZGEvcXVldWU+IGNhdCBz Y2hlZHVsZXIgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKbm9uZQptZXJrYWJhOi9zeXMv YmxvY2svc2RhL3F1ZXVlPiBlY2hvICJub29wIiA+IHNjaGVkdWxlcgptZXJrYWJhOi9zeXMvYmxv Y2svc2RhL3F1ZXVlPiBjYXQgc2NoZWR1bGVyICAgICAgICAgIApub25lCgpTbyB3aXRoIGJsay1t cSBJIGRvIG5vdCBnZXQgYSBjaG9pY2Ugd2hpY2ggc2NoZWR1bGVyIHRvIHVzZSBhbnl3YXkuIFdo aWNoIGlzIAp3aGF0IEkgZXhwZWN0LiBUaGF0cyB3aHkgdGhlcmUgaGFzIGJlZW4gYSBkaXNjdXNz aW9uIGFib3V0IGJsay1tcSBvbiAKcm90YXRpb25hbCBkZXZpY2VzIHJlY2VudGx5LgoKPiA+PiBJ IGhhdmUgZm91bmQgYSByZWNlbnQgZGlzY3Vzc2lvbiBvbiB0aGUgQ2VwaCBtYWlsaW5nIGxpc3Qs IGFueW9uZSBmcm9tCj4gPj4gWEZTCj4gPj4gdGhhdCBjYW4gaGVscCB1cz8KPiA+PiAKPiA+PiAq aHR0cDovL3d3dy5zcGluaWNzLm5ldC9saXN0cy9jZXBoLXVzZXJzL21zZzIyMDUzLmh0bWwKPiA+ IAo+ID4gQWxzbyBzZWU6Cj4gPiAKPiA+IGh0dHA6Ly94ZnMub3JnL2luZGV4LnBocC8KPiA+IFhG U19GQVEjUS5fU2hvdWxkX2JhcnJpZXJzX2JlX2VuYWJsZWRfd2l0aF9zdG9yYWdlX3doaWNoX2hh c19hX3BlcnNpc3RlbnRfCj4gPiB3cml0ZV9jYWNoZS4gM0YKPiAKPiBJJ3ZlIGFscmVhZHkgcmVh ZCB0aGF0IFhGUyB3aWtpIGVudHJ5IGJlZm9yZSBhbmQgYWxzbyBmb3VuZCBzb21lIEludGVsCj4g cHJlc2VudGF0aW9ucyB3aGVyZSB0aGV5IHN1Z2dlc3QgdG8gdXNlIG5vYmFycmllciB3aXRoCj4g dGhlcmUgZW50ZXJwcmlzZSBTU0RzLiBCdXQgYSBjb25maXJtYXRpb24gZnJvbSBhbnkgYmxvY2sg bGF5ZXIKPiBzcGVjaWFsaXN0IHdvdWxkIGJlIGEgZ29vZCB0aGluZyEKCkkgdGhpbmsgSmVucyBB eGJvZSB3b3VsZCBiZSBnb29kIHRvIGFzaz8gQnV0IGFzIEplZmYgTW95ZXIgYWxyZWFkeSByZXBs aWVkIHRvIAp0aGUgYnVnIHJlcG9ydD8KCj4gPj4gKmh0dHBzOi8vYnVnemlsbGEucmVkaGF0LmNv bS9zaG93X2J1Zy5jZ2k/aWQ9MTEwNDM4MAo+ID4gCj4gPiBJbnRlcmVzdGluZy4gTmV2ZXIgdGhv dWdodCBvZiB0aGF0IG9uZS4KPiA+IAo+ID4gU28gd291bGQgaXQgYmUgc2FmZSB0byBpbnRlcnJ1 cHQgdGhlIGZsb3cgb2YgZGF0YSB0b3dhcmRzIHRoZSBTU0QgYXQgYW55Cj4gPiBwb2ludCBpZiB0 aW1lIHdpdGggcmVvcmRlcmluZyBJL08gc2NoZWR1bGVycyBpbiBwbGFjZT8gQW5kIGhvdyBhYm91 dAo+ID4gYmxrLW1xIHdoaWNoIGhhcyBtdXRpcGxlIHNvZnR3YXJlIHF1ZXVzPwo+IAo+IE1heWJl IHdlIHNob3VsZCBhc2sgdGhlIGJsb2NrIGxheWVyIG1haWxpbmcgbGlzdCBhYm91dCB0aGF0Pwo+ IAo+ID4gSSBsaWtlIHRvIHRoaW5rIHRoYXQgdGhleSBhcmUgc3RpbGwgaW5kZXBlbmRlbnQgb2Yg dGhlIGJhcnJpZXIgdGhpbmcgYW5kCj4gPiB0aGU+IAo+ID4gbGFzdCBidWcgY29tbWVudCBieSBF cmljLCB3aGVyZSBoZSBxdW90ZWQgZnJvbSBKZWZmLCBzdXBwb3J0cyB0aGlzOgo+ID4+IEVyaWMg U2FuZGVlbiAyMDE0LTA2LTI0IDEwOjMyOjA2IEVEVAo+ID4+IAo+ID4+IEFzIEplZmYgTW95ZXIg c2F5czoKPiA+Pj4gVGhlIGZpbGUgc3lzdGVtIHdpbGwgbWFudWFsbHkgb3JkZXIgZGVwZW5kZW50 IEkvTy4KPiA+Pj4gV2hhdCBJIG1lYW4gYnkgdGhhdCBpcyB0aGUgZmlsZSBzeXN0ZW0gd2lsbCBz ZW5kIGRvd24gYW55IEkvTyBmb3IgdGhlCj4gPj4+IHRyYW5zYWN0aW9uIGxvZywgd2FpdCBmb3Ig dGhhdCB0byBjb21wbGV0ZSwgaXNzdWUgYSBiYXJyaWVyICh3aGljaCB3aWxsCj4gPj4+IGJlIGEg bm9vcCBpbiB0aGUgY2FzZSBvZiBhIGJhdHRlcnktYmFja2VkIHdyaXRlIGNhY2hlKSwgYW5kIHRo ZW4gc2VuZAo+ID4+PiBkb3duIHRoZSBjb21taXQgYmxvY2sgYWxvbmcgd2l0aCBhbm90aGVyIGJh cnJpZXIuICBBcyBzdWNoLCB5b3UgY2Fubm90Cj4gPj4+IGhhdmUgdGhlIEkvTyBzY2hlZHVsZXIg cmVvcmRlciB0aGUgY29tbWl0IGJsb2NrIGFuZCB0aGUgbG9nIGVudHJ5IHdpdGgKPiA+Pj4gd2hp Y2ggaXQgaXMgYXNzb2NpYXRlZC4KPiAKPiBJZiBpdCBpcyB0cnVseSB0aGF0IHdheSB0aGVuIEkg ZG8gbm90IHNlZSBhbnkgcHJvYmxlbXMgdXNpbmcgbm9iYXJyaWVyCj4gd2l0aCB0aGUgU1NEcyBh biBwb3dlciBsb3NzIHByb3RlY3Rpb24uCj4gSSBoYXZlIGFscmVhZHkgZmluZCBzb21lIHBlb3Bs ZSBzYXkgdGhhdCBlbnRlcnByaXNlIFNTRHMgd2l0aCBQTFAgc2ltcGx5Cj4gaWdub3JlIHRoZSBz eW5jIGNhbGwuIElmIHRoYXQncyB0aGUgY2FzZQo+IHRoZW4gdXNpbmcgbm9iYXJyaWVyIHdvdWxk IGhhdmUgbm8gcGVyZm9ybWFuY2UgaW1wcm92ZW1lbnQuLi4KCkludGVyZXN0aW5nLiBJIHRoaW5r IGlmIHRoZXkgaWdub3JlIGl0IHRvdWdoIHRoZXkgcmlzayBkYXRhIGxvc3MuIENhdXNlIEkgCmlt YWdpbmUgdGhlcmUgbWlnaHQgYmUgYSBzbGlnaHQgY2hhbmNlIHdoZXJlIHRoZSBkYXRhIGhhcyBi ZWVuIHNlbnQgYnkgdGhlIApjb250cm9sbGVyLCBidXQgbm90IHlldCBmdWxseSBzdG9yZWQgaW4g U1NEIERSQU0uIE9yIGlzIHRoaXMgb3BlcmF0aW9uIGF0b21pYz8KClRoYW5rcywKLS0gCk1hcnRp bgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KeGZzIG1h aWxpbmcgbGlzdAp4ZnNAb3NzLnNnaS5jb20KaHR0cDovL29zcy5zZ2kuY29tL21haWxtYW4vbGlz dGluZm8veGZzCg==