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Mon, 28 Dec 2020 01:33:45 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 0C7D6C43461; Mon, 28 Dec 2020 01:33:44 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cang) by smtp.codeaurora.org (Postfix) with ESMTPSA id 434FDC433CA; Mon, 28 Dec 2020 01:33:44 +0000 (UTC) MIME-Version: 1.0 Date: Mon, 28 Dec 2020 09:33:44 +0800 From: Can Guo To: Stanley Chu Subject: Re: [PATCH v1] scsi: ufs-mediatek: Enable UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL In-Reply-To: <1608817657.14045.30.camel@mtkswgap22> References: <20201222072928.32328-1-stanley.chu@mediatek.com> <1608697172.14045.5.camel@mtkswgap22> <1608796334.14045.21.camel@mtkswgap22> <5eb12622222bd9ba5e705801a204f3160ba3966b.camel@gmail.com> <1608817657.14045.30.camel@mtkswgap22> Message-ID: X-Sender: cang@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201227_203347_318213_32323F13 X-CRM114-Status: GOOD ( 25.29 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jiajie.hao@mediatek.com, Bean Huo , linux-scsi@vger.kernel.org, martin.petersen@oracle.com, andy.teng@mediatek.com, jejb@linux.ibm.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org, cc.chou@mediatek.com, Avri Altman , alice.chao@mediatek.com, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, alim.akhtar@samsung.com, matthias.bgg@gmail.com, asutoshd@codeaurora.org, chaotian.jing@mediatek.com, bvanassche@acm.org, linux-arm-kernel@lists.infradead.org, beanhuo@micron.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 2020-12-24 21:47, Stanley Chu wrote: > Hi Avri, Bean, > > On Thu, 2020-12-24 at 13:01 +0100, Bean Huo wrote: >> On Thu, 2020-12-24 at 11:03 +0000, Avri Altman wrote: >> > > > Do you see any substantial benefit of having >> > > > fWriteBoosterBufferFlushEn >> > > > disabled? >> > > >> > > 1. The definition of fWriteBoosterBufferFlushEn is that host allows >> > > device to do flush in anytime after fWriteBoosterBufferFlushEn is >> > > set as >> > > on. This is not what we want. >> > > >> > > Just Like BKOP, We do not want flush happening beyond host's >> > > expected >> > > timing that device performance may be "randomly" dropped. >> > >> > Explicit flush takes place only when the device is idle: >> > if fWriteBoosterBufferFlushEn is set, the device is idle, and before >> > h8 received. >> > If a request arrives, the flush operation should be halted. >> > So no performance degradation is expected. >> >> Hi Stanley >> >> Avri's comment is correct, fWriteBoosterBufferFlushEn==1, device will >> flush only when it is in idle, once there is new incoming request, the >> flush will be suspended. You should be very careful when you want to >> skip this stetting of this flag. > > Very appreciate your the clarification. > > However similar to "Background Operations Termination Latency", while > the next request comes, device may need some time to suspend on-going > flush operations. This delay may "randomly" degrade the performance > right? That can be case by case (or vendor by vendor), but generally I agree with you on this. > > Since the configuration, i.e., enable > fWriteBoosterBufferFlushDuringHibernate only with > fWriteBoosterBufferFlushEn disabled, has been applied in many of our > mass-produced products these yeas, we would like to keep it unless the > new setting has obvious benefits. Thanks for sharing the info. I will leave the decision to Asutosh on this. Thanks, Can Guo. > > Thanks, > Stanley Chu > >> >> Bean >> _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek