SCHED_ULE should not be the default
Oliver Brandmueller
ob at e-Gitt.NET
Thu Dec 22 16:02:01 UTC 2011
On Thu, Dec 15, 2011 at 05:25:51PM +0100, Attilio Rao wrote:
> If someone else thinks he has a specific problem that is not
> characterized by one of the cases above please let me know and I will
> put this in the chart.
It seems I stumbled over another thing.
Setup: 2 Servers providing devices by ggated, 1 Server using ggatec for
those devices. ZFS over each a pair of disks provided by both ggated
servers. I use rsync to fill up the 6 zpools/zfs from an existing
storage (2 TB zpools, about 500 to 700 GiB user per pool). 2 rsyncs
running in parallel to fill the partitions. Main server (ggate client
with ZFS and rsync) has an Intel Xeon X3450 2.66 GHz quadcore processor
(+HTT or whatever it's called nowadays, gives 8 "cpus" in FreeBSD).
With ULE ZFS gets slower after some time and finally gets stuck after 1
to 3 days of continouus synchronisation (ggate works like a charm as far
as I can tell), with 4BSD (online since 6 days) the rsync seems to run a
lot faster and I didn't get ZFS to stall. There's nearly no local I/O
(system is on a local SSD) and the load/CPU usage are not actually high.
All is running a quite recent RELENG_9
If anyone's interested I can get more detail and carry out some tests.
- Oliver
--
| Oliver Brandmueller http://sysadm.in/ ob at sysadm.in |
| Ich bin das Internet. Sowahr ich Gott helfe. |
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