On 12/09/11 18:56, Luke Martinez wrote:
> Should I look at all release notes for drivers for every bit of
> hardware, expecting someone to do that is ridiculous. I did a bit of
> research on my card 555GTM + linux, i had linux drivers etc. Any sane
> person would expect it to work.
Indeed, any sane person would *expect* it to work, but then, sane people
probably go out and buy machines with OSX or Windows pre-installed.
This is why I don't try and persuade friends, family or even random
strangers to use Linux on their desktops any more. There's always
something that doesn't quite work. Ubuntu have gone a long way towards
trying to integrate the work of third-party binary drivers into a system
which normal users can cope with, but stuff is still miles away from
being reliably usable on 99% of modern systems :(
I've been using ejabberd for a while, but it's painful. It has an extra
daemon process used for mysterious Erlang stuff, it binds to more ports than
it should, and it doesn't work without a lot of fiddling.
I'd like a simple jabber server that uses plain text files to tell it the IP
address to bind to and the valid user-names and to have a simple utility for
generating passwords like the htpasswd program that comes with Apache.
Getting Apache going is MUCH easier than getting ejabberd going, but Apache is
a much more complex program.
Back in the days of Debian/Lenny I investigated all the options and determined
that ejabberd was best. I may have been wrong then, but even if I was right
there is scope for other programs to have been improved.
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
I am a Mailing list noob... o.O
Well this Dell XPS 15 laptop has everything except for Nvidia working.
Suspend, wifi (Linux 3.0+), touchpad (3.1+), bluetooth, Fn+turn off
touchpad.
Although touchpad + wifi was a problem when i installed Fedora which had an
earlier kernel.
Regards,
Luke
On Wed, Sep 14, 2011 at 3:26 PM, Luke Martinez <me(a)luke.asia> wrote:
> Well this Dell XPS 15 laptop has everything except for Nvidia working.
> Suspend, wifi (Linux 3.0+), touchpad (3.1+), bluetooth, Fn+turn off
> touchpad.
>
> Although touchpad + wifi was a problem when i installed Fedora which had an
> earlier kernel.
>
> Regards,
> Luke
>
>
> On Wed, Sep 14, 2011 at 3:19 PM, James Harper <
> james.harper(a)bendigoit.com.au> wrote:
>
>> > On 14/09/11 14:45, Craig Sanders wrote:
>> > > support for laptop-specific stuff (graphics switching, etc) on linux
>> > > is still problematic. If you choose your laptop carefully, it works
>> > > great. But if you just buy one without researching it thoroughly,
>> > > you'll probably be disappointed.
>> >
>> > Most people I know who aren't serious techies just have laptops. I
>> have gone
>> > through quite a lot of laptops too.
>> > NONE of them have managed to work out-of-the-box properly with Linux.
>> > Usual suspects are the wifi or suspend not working, but if it's not
>> that, it's
>> > something else like sound or accelerated video.
>> >
>>
>> The second-hand market is great for Linux use. Unless you want something
>> exceptionally fast and shiny and new, a 3 year old laptop will probably
>> work just great with some more memory and maybe a new battery. I was
>> recently gifted an old HP nx7010 (which is maybe a little older than 3
>> years) and Ubuntu "just worked" with the exception of tv out which
>> required a tiny bit of fiddling. Wireless, graphics, touch pad, all
>> good. When doing repairs on laptops I often boot off a Linux USB stick
>> to test things and haven't had problems except for some very new models,
>> although a USB recovery stick hardly equates to production use - I'm
>> guessing if I wanted accelerated graphics I might have more trouble with
>> the newer stuff.
>>
>> James
>>
>>
>>
>> _______________________________________________
>> luv-main mailing list
>> luv-main(a)lists.luv.asn.au
>> http://lists.luv.asn.au/listinfo/luv-main
>>
>
>
On 10/09/11 14:57, Daniel Pittman wrote:
> On Fri, Sep 9, 2011 at 21:41, Craig Sanders<cas(a)taz.net.au> wrote:
>> On Sat, Sep 10, 2011 at 12:30:07PM +1000, Tim Connors wrote:
>>>> I woke up yesterday morning to find my system load avg at over 100 - due
>>>> [...]
>>>> worse, it crashed later even without mlocate running. backuppc scheduled
>>>
>>> It's true, the linux VMM is a bit shit. A load of 100 is just a slight
>>> bit crap.
>>
>> all waiting for IO. it's hardly linux' fault that some process is going
>> apeshit creating a hard-link farm.
>
> What puzzles me in this discussion is that linking and deleting, in
> BackupPC, are a single-threaded operation. One Perl process running,
> chewing through one file system operation after another. So, while I
> have no doubt it caused this, it feels like there is some underlying
> problem lurking in there, waiting for the next time something has a
> similar meta-data heavy set of operations happening...
For what it's worth, we've seen issues with BackupPC causing excessive
laod and nearly killing machines in a manner much like this too.
I wasn't investigating that one so can't provide much useful info, other
than another data point of "it does happen".
Toby
As I threatened to do earlier today, I've run ZFS up against the
PostgreSQL benchmark, along with ext4 and ZFS.
(You may remember I did this a while back, looking at ext2/3/4, btrfs
and xfs)
I ran the results on Ubuntu 11.04 with Pg 9.0 and Ubuntu 11.10 beta with
Pg 9.1. In the following results, the first combo is called "natty" and
the second one "oneiric".
The latter combination showed a considerable performance improvement
overall - although I didn't investigate to find out whether this was due
to kernel improvements, postgres improvements, or virtio improvements.
The results are measured in transactions-per-second, with higher numbers
being better.
ext4 (data=writeback,relatime):
natty: 248
oneiric: 297
ext4 (data=writeback,relatime,nobarrier):
natty: didn't test
oneiric: 1409
xfs (relatime):
natty: didn't test
oneiric: 171
btrfs (relatime):
natty: 61.5
oneiric: 91
btrfs (relatime,nodatacow):
natty: didn't test
oneiric: 128
zfs (defaults):
natty: 171
oneiric: 996
Conclusion:
Last time I ran these tests, xfs and ext4 pulled very similar results,
and both were miles ahead of btrfs. This time around, ext4 has managed
to get a significantly faster result than xfs. However we have a new
contender - ZFS performed *extremely* well on the latest Ubuntu setup -
achieving triple the performance of regular ext4!
I am suspicious that ZFS may not be using any "barrier" coding though -
and if ext4 has those disabled, it surpasses even ZFSs high score.
Oddly, ZFS performed wildly differently on ubuntu 11.04 vs 11.10b. I
can't explain this. Any ideas?
Cheers,
Toby
ejabberd likes to listen on multiple TCP ports and bind to 0.0.0.0. I can't
stop it from binding because then it can't do it's own IPC but I don't want to
expose it to the world.
Below is the script that I am currently using, the result of this is that the
client that connects to one of the undesired ports just gets no response.
I can't use -mowner in an INPUT chain. Is there any way I can convert a
SYN/ACK to a RST on the way out?
iptables -F OUTPUT
iptables -A OUTPUT -d 192.168.0.0/16 -j ACCEPT
iptables -A OUTPUT -d 127.0.0.0/8 -j ACCEPT
# limit ejabberd
iptables -A OUTPUT -p tcp --sport 5222 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 5269 -j ACCEPT
iptables -A OUTPUT -p tcp -mowner --uid-owner 203 -j REJECT --reject-with tcp-
reset
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
On 12/09/11 13:20, Jason White wrote:
> Peter Ross<Peter.Ross(a)bogen.in-berlin.de> wrote:
>
>> Every snapshot is like a filesystem, with its own metadata and data.
>>
>> They only "interfere" because they may point to the same (unchanged)
>> data. But there is no backtracking or reconstruction from one
>> snapshot to the other.
>
> My understanding is that this is also true of Btrfs snapshots. It should be
> noted that most of the metadata are not copied when a snapshot is created,
> judigng by the speed of this operation.
>
> Regarding ZFS, it is my impression that all of the people who understand the
> internals of the file system and its implementation are Sun/Solaris
> developers, some of whom may have left after the acquisition by Oracle. I
> don't know what situation this creates as to the availability of expertise (at
> the level of understanding the code well enough to debug it) for projects
> porting it to BSD and Linux.
>
> Btrfs does appear to be gaining contributions from a variety of sources,
> prominently Red Hat, so the expertise isn't concentrated in the hands of any
> single corporation.
Last time I checked, Btrfs had sucky performance, especially for
PostgreSQL loads. (Even with the "nodatacow" option enabled)
How does the DKIM-based ZFS look?
Otherwise I'm curious enough that I'll run up a test myself.
Cheers,
Toby