<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - CPU iowait higher when run the GPU multi decoding threads" href="https://bugs.freedesktop.org/show_bug.cgi?id=109830#c31">Comment # 31</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - CPU iowait higher when run the GPU multi decoding threads" href="https://bugs.freedesktop.org/show_bug.cgi?id=109830">bug 109830</a> from <a class="email" href="mailto:owen.zhang@intel.com" title="Owen Zhang <owen.zhang@intel.com>"> Owen Zhang</a> <pre>(In reply to Tvrtko Ursulin from <a href="show_bug.cgi?id=109830#c30">comment #30</a>) > (In reply to Owen Zhang from <a href="show_bug.cgi?id=109830#c27">comment #27</a>) > > Hi， > > > > i have made the following changes on kernel 4.19: > > > > 1) apply the following patch: > > <a href="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/">https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/</a> > > ?h=linux-4.20.y&id=0a2fff2428f1e175932dc3cf115b68c868e3a839 > > This patch makes a difference on it's own? How much? > > If it does, I think you have to test by ensuring input data is cached before > the timing run, and dump the output to /dev/null. > > Otherwise you are accounting for the changes in kernel's block and > filesystem subsystems as well. > > P.S. I haven't had the time yet to try the repro using the latest > instructions. only apply this patch, there hasn't any difference. it also need to change the io_schedule_timeout to schedule_timeout. both apply these two changes, the cpu iowait number will be down.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>