Re: UBIFS was Re: Compressed file system for SD?
Am Monday 13 October 2008 02:14:06 schrieb nickd: Bummer. Upon further reading I see the difference in flash devices now. Do you think UBIFS could replace JFFS on the Freerunner? Is there a benefit? Or is there not enough wiggle room on the FR for caching? It seems better overall [1]. Would it be possible to replace it yourself with the appropriate kernel modules etc? Ok enough questions ;-) -Nick 1. http://lwn.net/Articles/275706/ Lorn Potter wrote: nickd wrote: I haven't sorry. Coincidentaly, the new kernel which was released the other day (.27) includes a new filesystem designed for flash drives - UBIFS [1]. I wonder if this could be relevant to this project. It looks like it has full write-back support, meaning it doesn't need to write to the SD card all the time, although I guess we don't have that much memory to play with. ubifs wont work on sd cards, which are not true flash devices. but it is relevant and could replace jffs2. As could yaffs2. Missing just someone compiling an image and doing some benchmarks. With OE it should be easy. -- :M: ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Compressed file system for SD?
The jffs filesystem used on the NAND is compressing, which is great for our use case. For the SD that would also be very desirable (especially with the provided 512MB µSD), but it seems that ext3 is the filesystem of choice there. Has someone tried to use a compressing filesystem there? Stefan PS: I've used jffs2 on a USB drive (through block2mtd) and it works, but it's inefficient (because of block2mtd) and it's not clear how/if it would work here (it went through an initrd); but a basic x86 Debian install (for rescue, but including gcc to compile extra packages) fits just fine in 256MB this way, so 512MB would be plenty. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Compressed file system for SD?
Hey, great to see you here Stefan! The race for Emacs 23 on the Freerunner is on! Stefan Monnier [EMAIL PROTECTED] writes: The jffs filesystem used on the NAND is compressing, which is great for our use case. For the SD that would also be very desirable (especially with the provided 512MB µSD), but it seems that ext3 is the filesystem of choice there. Has someone tried to use a compressing filesystem there? Stefan PS: I've used jffs2 on a USB drive (through block2mtd) and it works, but it's inefficient (because of block2mtd) and it's not clear how/if it would work here (it went through an initrd); but a basic x86 Debian install (for rescue, but including gcc to compile extra packages) fits just fine in 256MB this way, so 512MB would be plenty. -- Joakim Verona ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
UBIFS was Re: Compressed file system for SD?
I haven't sorry. Coincidentaly, the new kernel which was released the other day (.27) includes a new filesystem designed for flash drives - UBIFS [1]. I wonder if this could be relevant to this project. It looks like it has full write-back support, meaning it doesn't need to write to the SD card all the time, although I guess we don't have that much memory to play with. -Nick 1. http://kernelnewbies.org/Linux_2_6_27#head-b8ec452c4a02e08d68deeba6f471680e15e42019 http://lwn.net/Articles/276025/ http://kernelnewbies.org/Linux_2_6_27Stefan Monnier wrote: The jffs filesystem used on the NAND is compressing, which is great for our use case. For the SD that would also be very desirable (especially with the provided 512MB µSD), but it seems that ext3 is the filesystem of choice there. Has someone tried to use a compressing filesystem there? Stefan PS: I've used jffs2 on a USB drive (through block2mtd) and it works, but it's inefficient (because of block2mtd) and it's not clear how/if it would work here (it went through an initrd); but a basic x86 Debian install (for rescue, but including gcc to compile extra packages) fits just fine in 256MB this way, so 512MB would be plenty. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: UBIFS was Re: Compressed file system for SD?
nickd wrote: I haven't sorry. Coincidentaly, the new kernel which was released the other day (.27) includes a new filesystem designed for flash drives - UBIFS [1]. I wonder if this could be relevant to this project. It looks like it has full write-back support, meaning it doesn't need to write to the SD card all the time, although I guess we don't have that much memory to play with. ubifs wont work on sd cards, which are not true flash devices. but it is relevant and could replace jffs2. Lorn 'ljp' Potter Software Engineer, Systems Group, Qt Software, Nokia Pty Ltd ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: UBIFS was Re: Compressed file system for SD?
Bummer. Upon further reading I see the difference in flash devices now. Do you think UBIFS could replace JFFS on the Freerunner? Is there a benefit? Or is there not enough wiggle room on the FR for caching? It seems better overall [1]. Would it be possible to replace it yourself with the appropriate kernel modules etc? Ok enough questions ;-) -Nick 1. http://lwn.net/Articles/275706/ Lorn Potter wrote: nickd wrote: I haven't sorry. Coincidentaly, the new kernel which was released the other day (.27) includes a new filesystem designed for flash drives - UBIFS [1]. I wonder if this could be relevant to this project. It looks like it has full write-back support, meaning it doesn't need to write to the SD card all the time, although I guess we don't have that much memory to play with. ubifs wont work on sd cards, which are not true flash devices. but it is relevant and could replace jffs2. Lorn 'ljp' Potter Software Engineer, Systems Group, Qt Software, Nokia Pty Ltd ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
