Hi Alan,
why do you think it will hurt single-threaded performance?
--
Paweł Jakub Dawidek
> On Jul 3, 2020, at 12:30, Alan Somers <asom...@freebsd.org> wrote:
>
> I'm using geli, gmultipath, and ZFS on a large system, with hundreds of
> drives. What I'm seeing is that under at least some workloads, the overall
> performance is limited by the single geom kernel process. procstat and
> kgdb aren't much help in telling exactly why this process is using so much
> CPU, but it certainly must be related to the fact that over 15,000 IOPs are
> going through that thread. What can I do to improve this situation? Would
> it make sense to enable direct dispatch for geli? That would hurt
> single-threaded performance, but probably improve performance for highly
> multithreaded workloads like mine.
>
> Example top output:
> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
> 13 root -8 - 0B 96K CPU46 46 82.7H 70.54%
> geom{g_down}
> 13 root -8 - 0B 96K - 9 35.5H 25.32%
> geom{g_up}
>
> -Alan
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