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OpenBSD General Other questions regarding OpenBSD which do not fit in any of the categories below. |
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nmbclusters
Hi,
Is it a good idea to change the limit of the nmbclusters value? http://rerepi.wordpress.com/2008/04/...sd-sysoev-rit/ set kern.ipc.nmbclusters=32768 What is the best way to change the nmbcluster value? Thanks. |
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OpenBSD has no such value to modify, at least not by that name.
anyway, trying to optimize one OS based on (out-of-date?) blog-post for another OS (albeit both are BSDs) is very close to shooting your own foot. so I'll vote for it being a bad idea. i suggest you to start a new thread asking for advice with whatever problem you were trying to solve with that optimization, if there actually is a limit you're encountering. |
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It influences the number of mbufs available in the kernel.
kern.ipc.nmbclusters is FreeBSD specific, in OpenBSD mbufs allocated is a function of maxusers; if you are willing, you can recompile the kernel and set NMBCLUSTERS. |
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My information came from "Mastering FreeBSD and OpenBSD Security," although the official documentation should supercede third-party advice as noted by jggimi.
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I heard that openbsd crashes under heavy loads
This is why I'm asking this.
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Quote:
http://marc.info/?l=openbsd-misc&w=2...nmbcluster&q=b Note that this information is also dated -- meaning that its application value to more recent versions of OpenBSD is questionable -- which is the point most of the project consistent make to users. In general, the tweaking of system parameters without significant knowledge & experience should be avoided altogether. The soundbite phrase frequently quoted is "Knobs are for knobs". Last edited by ocicat; 1st October 2012 at 08:33 PM. Reason: add clarity since archive information on this subject is also dated |
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As a final comment barti, you will not find high quality results by searching for OpenBSD-related information using a general-purpose search engine such as Google. Yes, Google may ultimately return hits to information found in the mailing lists, but those hits will not appear in on the first page of search results. The mailing lists simply do not receive enough traffic in order to get a search-order ranking equivalent to their value. This is why most information found the first page of Google searches is dreck.
The best information on OpenBSD is in the archives of the projects' mailing lists. To search the mailing lists specifically, look at any of the archive search engines discussed at the following: http://www.openbsd.org/mail.html |
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barti, there was an interesting discussion of kern.maxclusters and synpoxy today on misc@.
The conversation was in followup to a newbie question that began in August here: http://marc.info/?l=openbsd-misc&m=134565961307929&w=2 |
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openbsd crashes
I heard this from a tech support in a well known company (never mind).
They sell dedicated servers with freebsd and openbsd and linux and ..... He told me that freebsd performs much better then openbsd and that openbsd crashes under heavy loads. Thats all, no versions, no more. I was very sad to hear this. I read also that the openbsd developers will break things to make the system more secure. Maybe openbsd it TO MUCH to the limit and the price is to high in terms of performance and stability ? |
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Information about openbsd is HARD to find, a lot of 2000-2004 stuff out there.
I'm desperate, freebsd is much better with info. |
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True or not true ?
Will openbsd crash under heavy loads?
Is it true that freebsd performs much better then openbsd? ------------------------------------ http://bulk.fefe.de/scalability/ Tested on 2003 Since OpenBSD has so many data points with dramatically higher latency, it is the clear loser in this benchmark The clear winner in the graph is Linux 2.6. OpenBSD does not scale at all, and even panics under high load Whoa! Obviously, something is seriously broken in the OpenBSD memory management. OpenBSD is so incredibly slow that compared to this performance, NetBSD looks like Warp 9, and Linux is not even on the same chart. OpenBSD had big performance drops in the process, adding to the previous embarassment with mmap. I can really only warn of using OpenBSD for scalable network servers. The clear loser is, again, OpenBSD. Don't use OpenBSD for network servers. OpenBSD data points are all over the place in this graph; again, I would advise against using OpenBSD for scalable network servers OpenBSD 3.4 was a real stinker in these tests. The installation routine sucks, the disk performance sucks, the kernel was unstable, and in the network scalability department it was even outperformed by it's father, NetBSD. OpenBSD also gets points deducted for the sabotage they did to their IPv6 stack. If you are using OpenBSD, you should move away now. ================== Does openbsd in later versions do better then this? Did they fixed it? Because now I'm thinking again to go back to freebsd (serious). Thanks (and sorry) |
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In your history here, every time you have questioned the usability of this OS in this thread and in others, you cite third party information that has been incomplete, outdated, unsubstantiated, or misleading. Or you yourself may misunderstand. For example: Quote:
More information on ProPolice and W^X can be found in a number of the papers and presentations available through the Project website. Here's one that covers both of these technologies: http://www.openbsd.org/papers/auug04/index.html I'm sorry, barti, but I'm not going to try to defend the OS against every Internet posting you find in the wild and bring here. It is entirely up to you whether or not to use this OS. If you decide to do so, you should get your primary information on configuration, tuning, administration, and operation from official channels. And while I'm on the subject -- this forum, too, is third party and not an official channel. Last edited by jggimi; 3rd October 2012 at 02:39 AM. Reason: typos, clarity |
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Openbsd main problem
There is no up to date information avaliable, All you have is some posts 10 years ago.
For beginner to get to know this system is very hard task. Mailing lists don't help with big issues, usually people ask about some network card or some laptop compability. --------------------------- I don't see any replies to this tread. http://marc.info/?l=openbsd-misc&m=134565961307929&w=2 --------------------------- I did read about some people use it for high traffic servers but not many. Any way, I'm going to try it and see how it goes. Thanks. |
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press twice
[next in thread] Thanks. |
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