Quoting Chris Mason (2013-03-22 16:31:42)
Going through the code here, when I change the test to truncate once in
the very beginning, I still get errors. So, it isn't an interaction
between mmap and truncate. It must be a problem between lzo and mmap.
With compression off, we use
Quoting Alexandre Oliva (2013-03-22 01:27:42)
On Mar 21, 2013, Chris Mason chris.ma...@fusionio.com wrote:
Quoting Chris Mason (2013-03-21 14:06:14)
With mmap the kernel can pick any given time to start writing out dirty
pages. The idea is that if the application makes more changes
Quoting Alexandre Oliva (2013-03-22 10:17:30)
On Mar 22, 2013, Chris Mason clma...@fusionio.com wrote:
Are you using compression in btrfs or just in leveldb?
btrfs lzo compression.
Perfect, I'll focus on that part of things.
I'd like to take snapshots out of the picture for a minute
is initiated
so there should be no in-progress writes to leveldb other than leveldb
compaction (though that might be something to investigate).
-Sam
On Fri, Mar 22, 2013 at 7:26 AM, Chris Mason clma...@fusionio.com wrote:
Quoting Alexandre Oliva (2013-03-22 10:17:30)
On Mar 22, 2013, Chris
[ mmap corruptions with leveldb and btrfs compression ]
I ran this a number of times with compression off and wasn't able to
trigger problems. With compress=lzo, I see errors on every run.
Compile: gcc -Wall -o mmap-trunc mmap-trunc.c
Run: ./mmap-trunc file_name
The basic idea is to create a
Quoting Chris Mason (2013-03-22 14:07:05)
[ mmap corruptions with leveldb and btrfs compression ]
I ran this a number of times with compression off and wasn't able to
trigger problems. With compress=lzo, I see errors on every run.
Compile: gcc -Wall -o mmap-trunc mmap-trunc.c
Run: ./mmap
Quoting Chris Mason (2013-03-21 14:06:14)
Quoting Alexandre Oliva (2013-03-21 03:14:02)
On Mar 19, 2013, Alexandre Oliva ol...@gnu.org wrote:
On Mar 19, 2013, Alexandre Oliva ol...@gnu.org wrote:
that is being processed inside the snapshot.
This doesn't explain why the master
Quoting Alexandre Oliva (2013-03-19 01:20:10)
On Mar 18, 2013, Chris Mason chris.ma...@fusionio.com wrote:
A few questions. Does leveldb use O_DIRECT and mmap together?
No, it doesn't use O_DIRECT at all. Its I/O interface is very
simplified: it just opens each new file (database chunks
A few questions. Does leveldb use O_DIRECT and mmap together? (the
source of a write being pages that are mmap'd from somewhere else)
That's the most likely place for this kind of problem. Also, you
mention crc errors. Are those reported by btrfs or are they application
level crcs.
Thanks for
On Tue, Jun 12, 2012 at 09:46:26PM -0600, Alexandre Oliva wrote:
Hi, Greg,
There's a btrfs regression in 3.4 that's causing a lot of grief to
ceph-on-btrfs users like myself. This small and nice patch cures it.
It's in Linus' master already. I've been running it on top of 3.4.2,
and it
On Tue, Jan 24, 2012 at 08:15:58PM +0100, Martin Mailand wrote:
Hi
I tried the branch on one of my ceph osd, and there is a big
difference in the performance.
The average request size stayed high, but after around a hour the
kernel crashed.
IOstat
http://pastebin.com/xjuriJ6J
Kernel
On Mon, Jan 23, 2012 at 01:19:29PM -0500, Josef Bacik wrote:
On Fri, Jan 20, 2012 at 01:13:37PM +0100, Christian Brunner wrote:
As you might know, I have been seeing btrfs slowdowns in our ceph
cluster for quite some time. Even with the latest btrfs code for 3.3
I'm still seeing these
On Tue, Oct 25, 2011 at 04:22:48PM -0400, Josef Bacik wrote:
On Tue, Oct 25, 2011 at 04:15:45PM -0400, Chris Mason wrote:
On Tue, Oct 25, 2011 at 11:05:12AM -0400, Josef Bacik wrote:
On Tue, Oct 25, 2011 at 04:25:02PM +0200, Christian Brunner wrote:
Attached is a perf-report. I have
On Tue, Oct 25, 2011 at 11:05:12AM -0400, Josef Bacik wrote:
On Tue, Oct 25, 2011 at 04:25:02PM +0200, Christian Brunner wrote:
Attached is a perf-report. I have included the whole report, so that
you can see the difference between the good and the bad
btrfs-endio-wri.
We also
On Mon, Oct 24, 2011 at 03:51:47PM -0400, Josef Bacik wrote:
On Mon, Oct 24, 2011 at 10:06:49AM -0700, Sage Weil wrote:
[adding linux-btrfs to cc]
Josef, Chris, any ideas on the below issues?
On Mon, 24 Oct 2011, Christian Brunner wrote:
Thanks for explaining this. I don't have any
Excerpts from Christian Brunner's message of 2011-07-25 03:54:47 -0400:
Hi,
we are running a ceph cluster with btrfs as it's base filesystem
(kernel 3.0). At the beginning everything worked very well, but after
a few days (2-3) things are getting very slow.
When I look at the object store
Excerpts from Jim Schutt's message of 2011-06-10 13:06:22 -0400:
[ two different btrfs crashes ]
I think your two crashes in btrfs were from the uninit variables and
those should be fixed in rc2.
When I did my bisection, my criteria for success/failure was
did mkcephfs succeed?. When I apply
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