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([240b:10:2720:5510:a182:288:3ffa:432a]) by smtp.gmail.com with ESMTPSA id a127sm9765594pfa.111.2020.03.30.02.15.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2020 02:15:44 -0700 (PDT) Subject: Re: [PATCH] block, nvme: Increase max segments parameter setting value To: Ming Lei References: <20200323182324.3243-1-ikegami.t@gmail.com> <20200324000237.GB15091@redsun51.ssa.fujisawa.hgst.com> <6b73db44-ca3f-4285-0c91-dc1b1a5ca9f1@gmail.com> <20200327181825.GA8356@redsun51.ssa.fujisawa.hgst.com> From: Tokunori Ikegami Message-ID: Date: Mon, 30 Mar 2020 18:15:41 +0900 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200330_021545_842120_EC654978 X-CRM114-Status: GOOD ( 16.48 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Keith Busch , "linux-block@vger.kernel.org" , Chaitanya Kulkarni , "linux-nvme@lists.infradead.org" Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Ck9uIDIwMjAvMDMvMjkgMTI6MDEsIE1pbmcgTGVpIHdyb3RlOgo+IE9uIFNhdCwgTWFyIDI4LCAy MDIwIGF0IDg6NTcgUE0gVG9rdW5vcmkgSWtlZ2FtaSA8aWtlZ2FtaS50QGdtYWlsLmNvbT4gd3Jv dGU6Cj4+IEhpLAo+Pgo+PiBPbiAyMDIwLzAzLzI4IDExOjExLCBNaW5nIExlaSB3cm90ZToKPj4+ IE9uIFNhdCwgTWFyIDI4LCAyMDIwIGF0IDI6MTggQU0gS2VpdGggQnVzY2ggPGtidXNjaEBrZXJu ZWwub3JnPiB3cm90ZToKPj4+PiBPbiBTYXQsIE1hciAyOCwgMjAyMCBhdCAwMjo1MDo0M0FNICsw OTAwLCBUb2t1bm9yaSBJa2VnYW1pIHdyb3RlOgo+Pj4+PiBPbiAyMDIwLzAzLzI1IDE6NTEsIFRv a3Vub3JpIElrZWdhbWkgd3JvdGU6Cj4+Pj4+PiBPbiAyMDIwLzAzLzI0IDk6MDIsIEtlaXRoIEJ1 c2NoIHdyb3RlOgo+Pj4+Pj4+IFdlIGRpZG4ndCBoYXZlIDMyLWJpdCBtYXggc2VnbWVudHMgYmVm b3JlLCB0aG91Z2guIFdoeSB3YXMgMTYtYml0cwo+Pj4+Pj4+IGVub3VnaCBpbiBvbGRlciBrZXJu ZWxzPyBXaGljaCBrZXJuZWwgZGlkIHRoaXMgc3RvcCB3b3JraW5nPwo+Pj4+Pj4gTm93IEkgYW0g YXNraW5nIHRoZSBkZXRhaWwgaW5mb3JtYXRpb24gdG8gdGhlIHJlcG9ydGVyIHNvIGxldCBtZQo+ Pj4+Pj4gdXBkYXRlIGxhdGVyLiAgVGhhdCB3YXMgYWJsZSB0byB1c2UgdGhlIHNhbWUgY29tbWFu ZCBzY3JpcHQgd2l0aCB0aGUKPj4+Pj4+IGxhcmdlIGRhdGEgbGVuZ3RoIGluIHRoZSBwYXN0Lgo+ Pj4+PiBJIGhhdmUganVzdCBjb25maXJtZWQgdGhlIGRldGFpbCBzbyBsZXQgbWUgdXBkYXRlIGJl bG93Lgo+Pj4+Pgo+Pj4+PiBUaGUgZGF0YSBsZW5ndGggMjAsNTMxLDcxMiAoMHgxMzk0QTAwKSBp cyB1c2VkIG9uIGtlcm5lbCAzLjEwLjAgKENlbnRPUwo+Pj4+PiA2NGJpdCkuCj4+Pj4+IEFsc28g aXQgaXMgZmFpbGVkIG9uIGtlcm5lbCAxMCA0LjEwLjAgKFVidW50dSAzMmJpdCkuCj4+Pj4+IEJ1 dCBqdXN0IGNvbmZpcm1lZCBpdCBhcyBzdWNjZWVkZWQgb24gYm90aCA0LjE1LjAgKFVidW50dSAz MmJpdCkgYW5kIDQuMTUuMQo+Pj4+PiAoVWJ1bnR1IDY0Yml0KS4KPj4+Pj4gU28gdGhlIG9yaWdp bmFsIDIwLDUzMSw3MTIgbGVuZ3RoIGZhaWx1cmUgaXNzdWUgc2VlbXMgYWxyZWFkeSByZXNvbHZl ZC4KPj4+Pj4KPj4+Pj4gSSB0ZXN0ZWQgdGhlIGRhdGEgbGVuZ3RoIDB4MTAwMDAwMDAgKDI2OCw0 MzUsNDU2KSBhbmQgaXQgaXMgZmFpbGVkCj4+Pj4+IEJ1dCBub3cgY29uZmlybWVkIGl0IGFzIGZh aWxlZCBvbiBhbGwgdGhlIGFib3ZlIGtlcm5lbCB2ZXJzaW9ucy4KPj4+Pj4gQWxzbyB0aGUgcGF0 Y2ggZml4ZXMgb25seSB0aGlzIDB4MTAwMDAwMDAgbGVuZ3RoIGZhaWx1cmUgaXNzdWUuCj4+Pj4g VGhpcyBpcyBhY3R1YWxseSBldmVuIG1vcmUgY29uZnVzaW5nLiBXZSBkbyBub3Qgc3VwcG9ydCAy NTZNQiB0cmFuc2ZlcnMKPj4+PiB3aXRoaW4gYSBzaW5nbGUgY29tbWFuZCBpbiB0aGUgcGNpIG52 bWUgZHJpdmVyIGFueW1vcmUuIFRoZSBtYXggaXMgNE1CLAo+Pj4+IHNvIEkgZG9uJ3Qgc2VlIGhv dyBpbmNyZWFzaW5nIHRoZSBtYXggc2VnbWVudHMgd2lsbCBoZWxwOiB5b3Ugc2hvdWxkIGJlCj4+ Pj4gaGl0dGluZyB0aGUgJ21heF9zZWN0b3JzJyBsaW1pdCBpZiB5b3UgZG9uJ3QgaGl0IHRoZSBz ZWdtZW50IGxpbWl0IGZpcnN0Lgo+Pj4gVGhhdCBsb29rcyBhIGJ1ZyBmb3IgcGFzc3Rocm91Z2gg cmVxLCBiZWNhdXNlICdtYXhfc2VjdG9ycycgbGltaXQgaXMgb25seQo+Pj4gY2hlY2tlZCBpbiBi aW9fYWRkX3BjX3BhZ2UoKSwgbm90IGRvbmUgaW4gYmxrX3JxX2FwcGVuZF9iaW8oKSwgc29tZXRo aW5nCj4+PiBsaWtlIHRoZSBmb2xsb3dpbmcgc2VlbXMgcmVxdWlyZWQ6Cj4+Pgo+Pj4gZGlmZiAt LWdpdCBhL2Jsb2NrL2Jsay1tYXAuYyBiL2Jsb2NrL2Jsay1tYXAuYwo+Pj4gaW5kZXggYjA3OTAy NjhlZDlkLi5lMTIwZDgwYjc1YTUgMTAwNjQ0Cj4+PiAtLS0gYS9ibG9jay9ibGstbWFwLmMKPj4+ ICsrKyBiL2Jsb2NrL2Jsay1tYXAuYwo+Pj4gQEAgLTIyLDYgKzIyLDEwIEBAIGludCBibGtfcnFf YXBwZW5kX2JpbyhzdHJ1Y3QgcmVxdWVzdCAqcnEsIHN0cnVjdCBiaW8gKipiaW8pCj4+PiAgICAg ICAgICAgc3RydWN0IGJpb192ZWMgYnY7Cj4+PiAgICAgICAgICAgdW5zaWduZWQgaW50IG5yX3Nl Z3MgPSAwOwo+Pj4KPj4+ICsgICAgICAgaWYgKCgocnEtPl9fZGF0YV9sZW4gKyAoKmJpbyktPmJp X2l0ZXIuYmlfc2l6ZSkgPj4gOSkgPgo+Pj4gKyAgICAgICAgICAgICAgICAgICAgICAgcXVldWVf bWF4X2h3X3NlY3RvcnMocnEtPnEpKQo+Pj4gKyAgICAgICAgICAgICAgIHJldHVybiAtRUlOVkFM Owo+Pj4gKwo+PiBJIGhhdmUganVzdCBjb25maXJtZWQgYWJvdXQgdGhlIG1heF9od19zZWN0b3Jz IGNoZWNraW5nIGJlbG93Lgo+PiBJdCBpcyBjaGVja2VkIGJ5IHRoZSBmdW5jdGlvbiBibGtfcnFf bWFwX2tlcm4oKSBhbHNvIGFzIGJlbG93Lgo+Pgo+PiAgICAgICBpZiAobGVuID4gKHF1ZXVlX21h eF9od19zZWN0b3JzKHEpIDw8IDkpKQo+PiAgICAgICAgICAgcmV0dXJuIC1FSU5WQUw7Cj4gVGhl IGFib3ZlIGNoZWNrIGRvZXNuJ3QgdGFrZSBycS0+X19kYXRhX2xlbiBpbnRvIGFjY291bnQuCgpU aGFua3MgZm9yIHRoZSBjb21tZW50IGFuZCBub3RlZCBpdC4KSSBoYXZlIGp1c3QgY29uZmlybWVk IHRoZSBiZWhhdmlvciBvbiA1LjYuMC1yYzcgYXMgYmVsb3cuCkl0IHdvcmtzIHRvIGxpbWl0IHRo ZSBkYXRhIGxlbmd0aCBzaXplIDRNQiBhcyBleHBlY3RlZCBiYXNpY2FsbHkuCkFsc28gaXQgY2Fu IGJlIGxpbWl0ZWQgYnkgdGhlIGNoZWNrIGV4aXN0ZWQgYmVsb3cgaW4gbGxfYmFja19tZXJnZV9m bigpLgoKIMKgwqDCoCBpZiAoYmxrX3JxX3NlY3RvcnMocmVxKSArIGJpb19zZWN0b3JzKGJpbykg PgogwqDCoMKgIMKgwqDCoCBibGtfcnFfZ2V0X21heF9zZWN0b3JzKHJlcSwgYmxrX3JxX3Bvcyhy ZXEpKSkgewoKQnV0IHRoZXJlIGlzIGEgY2FzZSB0aGF0IHRoZSBjb21tYW5kIGRhdGEgbGVuZ3Ro IGlzIGxpbWl0ZWQgYnkgNTEyS0IuCkkgYW0gbm90IHN1cmUgYWJvdXQgdGhpcyBjb25kaXRpb24g c28gbmVlZGVkIG1vcmUgaW52ZXN0aWdhdGlvbi4KClJlZ2FyZHMsCklrZWdhbWkKCgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1udm1lIG1haWxp bmcgbGlzdApsaW51eC1udm1lQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1udm1lCg==