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Petersen" Organization: Oracle Corporation References: <20180419215424.3557-1-longli@linuxonhyperv.com> Date: Fri, 20 Apr 2018 15:40:11 -0400 In-Reply-To: <20180419215424.3557-1-longli@linuxonhyperv.com> (Long Li's message of "Thu, 19 Apr 2018 14:54:24 -0700") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8869 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=275 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804200197 X-BeenThere: driverdev-devel@linuxdriverproject.org X-Mailman-Version: 2.1.24 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stephen Hemminger , linux-scsi@vger.kernel.org, "Martin K . Petersen" , Haiyang Zhang , "James E . J . Bottomley" , linux-kernel@vger.kernel.org, devel@linuxdriverproject.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Long, > This is a best effort for estimating on how busy the ring buffer is > for that channel, based on available buffer to write in percentage. It > is still possible that at the time of actual ring buffer write, the > space may not be available due to other processes may be writing at > the time. > > Selecting a channel based on how full it is can reduce the possibility > that a ring buffer write will fail, and avoid the situation a channel > is over busy. > > Now it's possible that storvsc can use a smaller ring buffer size > (e.g. 40k bytes) to take advantage of cache locality. Applied to 4.18/scsi-queue. Thank you! -- Martin K. Petersen Oracle Linux Engineering _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel