Re: what is the meaning of "optimization changed from TIME to SPACE"
In response to ivan dimitrov <[EMAIL PROTECTED]>: > OK, but maybe this is not my case. I am using about 10% ... > "/dev/md0 3.6M318K3.0M 9%/storage/pub/www/ram" > > But dmesg reports continuously: > /storage/pub/www/ram: optimization changed from TIME to SPACE > /storage/pub/www/ram: optimization changed from SPACE to TIME > > about 10 times per sec. > > so, how can i stop this optimization rock-and-roll? You didn't mention that it was flipping back and forth before. I expect that some program is creating files, then deleting them shortly after, resulting in the partition filling up, switching to space opt, then it's not full so it switches back to time opt. However, unless you look at the partition at exactly the right moment, you don't see those files. For example, was the optimization at space at the moment you took that df? You've got a 3.6M partition. I could fill that up accidentally in less than a second. I stand by my original advice to add space. Bump it up to 16M or 32M and see if the problem goes away. Alternately, if you're _really_ worried about what's taking up an unexpected 3.0M of space, you could enable audit and track what programs are creating files there. > Bill Moran <[EMAIL PROTECTED]> wrote: In response to Brian > : > > > ivan dimitrov wrote: > > > After upgrading from freebsd-5.5-R to 6.3-R, I get the following message > > > in dmesg: > > > > > > "/storage/pub/www/ram: optimization changed from TIME to SPACE" > > > > > > I use a ram disk via the md driver. > > > Here is the line from my fstab file: > > > > > > md /storage/pub/www/rammfs rw,-s4m 2 0 > > > > > > Does this mean that there is some sort of error? ...and is there anything > > > that can be done, so that I don't get this message in dmesg? > > > > > > Any help will be greatly appreciated :) > > UFS normally optimizes file placement for performance. Unfortunately, > in order to do this it has to write files in such a way that it > sometimes wastes some space. When the partition gets close to full, > FreeBSD automatically switches to "space optimization" which doesn't > waste any space, but doesn't perform as well. > > The short answer is, "This is happening because your partition is too > close to full. It's not an error, but you should clean up some files > or add space." > > It also has nothing to do with the difference between 5.5 and 6.3. > > -- > Bill Moran > http://www.potentialtech.com > ___ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > > > > - > Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it > now. > ___ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[EMAIL PROTECTED]" -- Bill Moran http://www.potentialtech.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: what is the meaning of "optimization changed from TIME to SPACE"
OK, but maybe this is not my case. I am using about 10% ... "/dev/md0 3.6M318K3.0M 9%/storage/pub/www/ram" But dmesg reports continuously: /storage/pub/www/ram: optimization changed from TIME to SPACE /storage/pub/www/ram: optimization changed from SPACE to TIME about 10 times per sec. so, how can i stop this optimization rock-and-roll? Bill Moran <[EMAIL PROTECTED]> wrote: In response to Brian : > ivan dimitrov wrote: > > After upgrading from freebsd-5.5-R to 6.3-R, I get the following message in > > dmesg: > > > > "/storage/pub/www/ram: optimization changed from TIME to SPACE" > > > > I use a ram disk via the md driver. > > Here is the line from my fstab file: > > > > md /storage/pub/www/rammfs rw,-s4m 2 0 > > > > Does this mean that there is some sort of error? ...and is there anything > > that can be done, so that I don't get this message in dmesg? > > > > Any help will be greatly appreciated :) UFS normally optimizes file placement for performance. Unfortunately, in order to do this it has to write files in such a way that it sometimes wastes some space. When the partition gets close to full, FreeBSD automatically switches to "space optimization" which doesn't waste any space, but doesn't perform as well. The short answer is, "This is happening because your partition is too close to full. It's not an error, but you should clean up some files or add space." It also has nothing to do with the difference between 5.5 and 6.3. -- Bill Moran http://www.potentialtech.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" - Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: what is the meaning of "optimization changed from TIME to SPACE"
-BEGIN PGP SIGNED MESSAGE- Hash: RIPEMD160 On Tue, 19 Feb 2008 10:21:18 -0500 Bill Moran <[EMAIL PROTECTED]> wrote: [...] > > ivan dimitrov wrote: > > > After upgrading from freebsd-5.5-R to 6.3-R, I get the following > > > message in dmesg: > > > > > > "/storage/pub/www/ram: optimization changed from TIME to SPACE" [...] > UFS normally optimizes file placement for performance. Unfortunately, > in order to do this it has to write files in such a way that it > sometimes wastes some space. When the partition gets close to full, > FreeBSD automatically switches to "space optimization" which doesn't > waste any space, but doesn't perform as well. > > The short answer is, "This is happening because your partition is too > close to full. It's not an error, but you should clean up some files > or add space." > > It also has nothing to do with the difference between 5.5 and 6.3. It seems that man pages (such as newfs(8) and tunefs(8)) don't have a lot of details about this matter. OP can also read this very informative post regarding disk fragmentation and time/space optimisation: http://lists.freebsd.org/pipermail/freebsd-stable/2007-April/034711.html Regards. - -- Nikola Lečić = Никола Лечић fingerprint : FEF3 66AF C90E EDC3 D878 7CDC 956D F4AB A377 1C9B -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.4 (FreeBSD) iQCVAwUBR7s+0fzDP9K2CKGYAQP7FQQAyrGPKIlbUCNPlasIpQJNAiJXYG7soOlG aj7ZpeL+Cnq/5EKT50TF9kc7tXvAOv9IrNsu6xg8QBe6gQVJJ/b56cKcZ48eC77y Pd+RXi/d1lweNZ9PSPqNpcsLvTrl/xnx4KOW7/E1jwFvufD01mgAsYDdVwa7KGrz Ky3Lv5ZlOLA= =5Thf -END PGP SIGNATURE- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: what is the meaning of "optimization changed from TIME to SPACE"
In response to Brian <[EMAIL PROTECTED]>: > ivan dimitrov wrote: > > After upgrading from freebsd-5.5-R to 6.3-R, I get the following message in > > dmesg: > > > > "/storage/pub/www/ram: optimization changed from TIME to SPACE" > > > > I use a ram disk via the md driver. > > Here is the line from my fstab file: > > > > md /storage/pub/www/rammfs rw,-s4m 2 0 > > > > Does this mean that there is some sort of error? ...and is there anything > > that can be done, so that I don't get this message in dmesg? > > > > Any help will be greatly appreciated :) UFS normally optimizes file placement for performance. Unfortunately, in order to do this it has to write files in such a way that it sometimes wastes some space. When the partition gets close to full, FreeBSD automatically switches to "space optimization" which doesn't waste any space, but doesn't perform as well. The short answer is, "This is happening because your partition is too close to full. It's not an error, but you should clean up some files or add space." It also has nothing to do with the difference between 5.5 and 6.3. -- Bill Moran http://www.potentialtech.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: what is the meaning of "optimization changed from TIME to SPACE"
ivan dimitrov wrote: After upgrading from freebsd-5.5-R to 6.3-R, I get the following message in dmesg: "/storage/pub/www/ram: optimization changed from TIME to SPACE" I use a ram disk via the md driver. Here is the line from my fstab file: md /storage/pub/www/rammfs rw,-s4m 2 0 Does this mean that there is some sort of error? ...and is there anything that can be done, so that I don't get this message in dmesg? Any help will be greatly appreciated :) - Looking for last minute shopping deals? Find them fast with Yahoo! Search. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" When I have seen this error in the past, the partition in question is near or at capacity. Brian ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: what is the meaning of "optimization changed from TIME to SPACE"
> "/storage/pub/www/ram: optimization changed from TIME to SPACE" This is not an error. It probably means the ramdisk changed it's allocation policy from preserving time to conserving space. Something what would happen if the data on it gets relatively (against available mem) big. I guess. Regards, Wouter ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
