On Wed, Jan 30, 2013 at 11:07 AM, Jan Kara <jack@xxxxxxx> wrote: > On Wed 30-01-13 00:26:58, Ted Tso wrote: >> On Wed, Jan 23, 2013 at 08:29:11PM +0100, Jan Kara wrote: >> > > old JBD: AIM7 jobs/min 97624.39; got 78193 jbd wakeups >> > > new JBD: AIM7 jobs/min 85929.43; got 6306999 jbd wakeups, 6264684 extra wakeups >> > Yeah, that's a lot. My guess would be *a lot* of processes are hanging in >> > start_this_handle() and waiting for transaction commit. Each of them calls >> > __log_start_commit() and things add up. Thanks for getting these numbers. >> >> Yeah, wow. That would imply that there are a huge number of processes >> that get hung up in start_this_handle(), and they are waking up the >> journal before the kjournald has a chance to set T_LOCKED (since then >> they would get blocked earlier in start_this_handle). >> >> Given that, I wonder if the following change would actually help or >> hurt things. Eric, would you be willing to ask your perf team to try >> testing out these patches? > Umm, I don't see anything. Forgot to attach them? > Here I catched the two patches: http://patchwork.ozlabs.org/patch/216768/ http://patchwork.ozlabs.org/patch/216767/ - Sedat - > Honza > -- > Jan Kara <jack@xxxxxxx> > SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
