On Sun, 26 May 2013 18:48:18 -0500
Adam Vande More wrote:
> Um, that is wrong. It is in fact the basically the point of TRIM.
> And SSD's typically use the best form of wear leveling and it's
> usually advisable to leave a bit of the drive unpartitioned/unused to
> ensure the wear leveling works
RW googlemail.com> writes:
>
> On Sun, 26 May 2013 12:36:42 + (UTC)
> jb wrote:
>
> > But, swapping is also a symptom, not a problem.
> > It is never a good idea to let it get to that point.
>
> No, there are thing that are better on disk than in memory. The most
> common example is tmpfs.
RW googlemail.com> writes:
> ...
> > Yes, there is some confusion about the diff, if any, between paging
> > and swapping.
> >
> > Paging - copying or moving pages between physical memory (RAM) and
> > secondary storage (e.g. hard disk), in both directions.
> > Swapping - nowdays is synonymous
On Wed, 29 May 2013 19:52:02 + (UTC)
jb wrote:
> RW googlemail.com> writes:
>
> >
> > BTW you mean paging, or swap use, rather that swapping. Linux
> > supports only paging, so it can be taken as read that swapping
> > means paging, but FreeBSD supports both.
>
> Yes, there is some confus
On May 29, 2013, at 3:52 PM, jb wrote:
> Yes, there is some confusion about the diff, if any, between paging and
> swapping.
>
> Paging - copying or moving pages between physical memory (RAM) and secondary
> storage (e.g. hard disk), in both directions.
> Swapping - nowdays is synonymous with
On Wed, May 29, 2013 at 2:52 PM, jb wrote:
> Well, Linux utilizes swap space as part of virtual memory.
As does every other Unix.
--
Adam Vande More
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RW googlemail.com> writes:
>
> On Sun, 26 May 2013 12:36:42 + (UTC)
> jb wrote:
>
> > But, swapping is also a symptom, not a problem.
> > It is never a good idea to let it get to that point.
>
> No, there are thing that are better on disk than in memory. The most
> common example is tmpfs.
PS -- Moderating questions@ is just awful. I'm disappointed.
On Wed, May 29, 2013 at 1:34 PM, Adam Vande More wrote:
> On Wed, May 29, 2013 at 1:05 PM, Warren Block wrote:
>> And you don't think the presence of TRIM--where the SSD can actually know
>> which blocks are no longer in use--is worth
On Wed, May 29, 2013 at 1:05 PM, Warren Block wrote:
> And you don't think the presence of TRIM--where the SSD can actually know
> which blocks are no longer in use--is worthwhile?
As a whole, TRIM is worthwhile. However when an SSD is
overprovisioned it provides a lot of benefits. TRIM-less sw
On Wed, 29 May 2013, Michael Sierchio wrote:
On Sun, May 26, 2013 at 6:17 PM, Adam Vande More wrote:
Normal dynamic wear leveling on a modern SSD will be better than
imposing an FS- backed swap for 4GB partion occupying a small fraction
of total drive space.
And you don't think the presence
On Sun, May 26, 2013 at 6:17 PM, Adam Vande More wrote:
>
> Normal dynamic wear leveling on a modern SSD will be better than
> imposing an FS- backed swap for 4GB partion occupying a small fraction
> of total drive space.
>
>
Quite so.
- M
___
freebsd-
On Wed, May 29, 2013 at 6:19 AM, jb wrote:
> - overcommitment of memory (a bluff asking to be punished by OOM killer)
No self respecting Unix has an OOM by default.
> - OOM killer
Are you suggesting FreeBSD does this crap?
> Besides, they allow sloppy/dangerous programming.
Yup, in the kernel
On Wed, 29 May 2013 13:57:22 +0200
Fred Morcos wrote:
> Linux has a sysctl variable vm.swappiness which you can set to 0 or 1
> out of 100. Not sure how to achieve the same on FreeBSD, maybe one or
> more combinations of the following?
You'll probably make things worse.
> vm.stats.vm.v_swappgso
On Sun, 26 May 2013 12:36:42 + (UTC)
jb wrote:
> But, swapping is also a symptom, not a problem.
> It is never a good idea to let it get to that point.
No, there are thing that are better on disk than in memory. The most
common example is tmpfs. It's much better that files left on tmpfs can
On Wed, May 29, 2013 at 1:19 PM, jb wrote:
> Fred Morcos gmail.com> writes:
>
> > ..
> > The improvement effect can be
> > noticed on large inputs. These algorithms will most probably perform
> quite
> > badly on small inputs.
>
> I think your concern has been addressed in review of various algo
Fred Morcos gmail.com> writes:
> ..
> The improvement effect can be
> noticed on large inputs. These algorithms will most probably perform quite
> badly on small inputs.
I think your concern has been addressed in review of various algos where base
case identification helped to avoid overhead co
On 26. mai 2013, at 10:58, "M. V." wrote:
> But recently I heard from a FreeBSD expert that I shouldn't have swap
> partition for my server, and having swap partition could make my server
> unstable
Any chance this could be a simple misunderstanding?
That he objected to the thought of the serv
On Tue, May 28, 2013 at 8:42 PM, jb wrote:
> Follow up comment.
>
> It has been pointed out to me that there is Varnish software taking
> advantage
> of system VMM and swap space.
>
> Well, there are cache-oblivious algorithms that perform as well, and so
> they
> make the above (disk access mode
Follow up comment.
It has been pointed out to me that there is Varnish software taking advantage
of system VMM and swap space.
Well, there are cache-oblivious algorithms that perform as well, and so they
make the above (disk access model; cache-aware model) unnecessary
(obsolete ?) and are super
jb gmail.com> writes:
> M. V. yahoo.com> writes:
>> recently I heard from a FreeBSD expert that I shouldn't have
>> swap partition for my server, and having swap partition could
>> make my server unstable.
> I think your FB expert was up to something. I bet he spoke out
> of experience.
>
>
On Sun, May 26, 2013 at 7:20 PM, Warren Block wrote:
> Which part?
This part: "Another problem with SSDs is that they can have
difficulty with wear leveling." Do as I suggested and you'll get
maximum life from the drive even with swap present. Even absent of
best practices, SSD's in general do
On Sun, 26 May 2013, Adam Vande More wrote:
On Sun, May 26, 2013 at 6:32 PM, Warren Block wrote:
Another problem with SSDs is that they can have difficulty with wear
leveling. This is even worse with swap because there is no way to use TRIM
to tell the SSD about blocks that have been freed.
On Sun, May 26, 2013 at 6:32 PM, Warren Block wrote:
> Another problem with SSDs is that they can have difficulty with wear
> leveling. This is even worse with swap because there is no way to use TRIM
> to tell the SSD about blocks that have been freed.
Um, that is wrong. It is in fact the bas
On Sun, 26 May 2013, Polytropon wrote:
On Sun, 26 May 2013 16:09:06 +0700, Erich Dollansky wrote:
Hi,
On Sun, 26 May 2013 01:58:32 -0700 (PDT)
"M. V." wrote:
I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive.
it's partitioned as normal (/ , /tmp, /var , /usr and swap) for
The Intel SLC mSATA drives I use in embedded devices don't support TRIM,
but - it doesn't seem to matter. Actually, I'm confident that just using
bare partitions for swap is fine, and I haven't had any of the trouble I
witnessed with MLC devices. The difference is that the size is limited to
unde
M. V. yahoo.com> writes:
>
> hi everyone,
>
> I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive. it's
partitioned as normal (/ , /tmp,
> /var , /usr and swap) for a long time now. But recently I heard from a
FreeBSD expert that I shouldn't have
> swap partition for my server,
On 26/05/2013 09:58, M. V. wrote:
> hi everyone,
>
> I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive. it's
> partitioned as normal (/ , /tmp, /var , /usr and swap) for a long time now.
> But recently I heard from a FreeBSD expert that I shouldn't have swap
> partition for m
Hi,
sorry for my English. Here is what I wanted to say.
On Sun, 26 May 2013 16:09:06 +0700
Erich Dollansky wrote:
> Hi,
>
> On Sun, 26 May 2013 01:58:32 -0700 (PDT)
> "M. V." wrote:
>
> > I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD
> > drive. it's partitioned as normal (/
On Sun, 26 May 2013 01:58:32 -0700 (PDT)
"M. V." wrote:
> hi everyone,
>
> I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive. it's
> partitioned as normal (/ , /tmp, /var , /usr and swap) for a long time now.
> But recently I heard from a FreeBSD expert that I shouldn't have
On Sun, 26 May 2013 16:09:06 +0700, Erich Dollansky wrote:
> Hi,
>
> On Sun, 26 May 2013 01:58:32 -0700 (PDT)
> "M. V." wrote:
>
> > I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive.
> > it's partitioned as normal (/ , /tmp, /var , /usr and swap) for a
> > long time now. But
Hi,
On Sun, 26 May 2013 01:58:32 -0700 (PDT)
"M. V." wrote:
> I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive.
> it's partitioned as normal (/ , /tmp, /var , /usr and swap) for a
> long time now. But recently I heard from a FreeBSD expert that I
> shouldn't have swap partiti
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