Looks like this message was initially viewed as spam because of an HTML subpart...trying it again... ---------- Forwarded message ---------- From: Roger Pack <rogerpack2005@gmail.com> Date: Wed, Mar 20, 2013 at 1:25 PM Subject: +1 for xz To: linux-btrfs@vger.kernel.org I see from https://btrfs.wiki.kernel.org/index.php/Compression#How_do_I_enable_compression.3F "LZ4" support is currently being added. Here''s my +1 for also adding something with "high" compression like xz or lzma, since they basically would offer the "high compression" option (which sometimes users may want, like myself on a VPS with limited disk space, or users who have a backup disk they want to sync only every so often, not read from often, etc.) Thanks and cheers! -roger- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
received here. +1 jffs2 has a lzma kernel compressor patch for 2.6 based on the lzma reference (7z?) source and lzo kernel compressor On Wed, Mar 20, 2013 at 12:27 PM, Roger Pack <rogerpack2005@gmail.com> wrote:> > Looks like this message was initially viewed as spam because of an > HTML subpart...trying it again... > > ---------- Forwarded message ---------- > From: Roger Pack <rogerpack2005@gmail.com> > Date: Wed, Mar 20, 2013 at 1:25 PM > Subject: +1 for xz > To: linux-btrfs@vger.kernel.org > > > I see from https://btrfs.wiki.kernel.org/index.php/Compression#How_do_I_enable_compression.3F > "LZ4" support is currently being added. Here''s my +1 for also adding > something with "high" compression like xz or lzma, since they > basically would offer the "high compression" option (which sometimes > users may want, like myself on a VPS with limited disk space, or users > who have a backup disk they want to sync only every so often, not read > from often, etc.) > Thanks and cheers! > -roger- > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Mar 20, 2013 at 01:27:11PM -0600, Roger Pack wrote:> I see from https://btrfs.wiki.kernel.org/index.php/Compression#How_do_I_enable_compression.3F > "LZ4" support is currently being added. Here''s my +1 for also adding > something with "high" compression like xz or lzma, since they > basically would offer the "high compression" option (which sometimes > users may want, like myself on a VPS with limited disk space, or users > who have a backup disk they want to sync only every so often, not read > from often, etc.)Somebody asked on irc about adding it some time ago, I''m half way through with lzma support. The compression infrastructure needs a few updates first, the on-disk format of the compressed chunks has to be extended to hold large contiguous chunks. (Other compressors would benefit from the changes, so it''s not just because of lzma.) First tests showed that it was really slow for normal use, but for backup purposes it might be not that bad. david -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
with lzo, and presumably lz4 the 128k extents of packed data are livable. on bootable thumbdrive images esp. with merged metadata I think favoring greater fragmentation vs. the current 128k would help, and giving larger files momentum to occupy more than 128k extents would also help. On Wed, Mar 20, 2013 at 4:29 PM, David Sterba <dsterba@suse.cz> wrote:> On Wed, Mar 20, 2013 at 01:27:11PM -0600, Roger Pack wrote: >> I see from https://btrfs.wiki.kernel.org/index.php/Compression#How_do_I_enable_compression.3F >> "LZ4" support is currently being added. Here''s my +1 for also adding >> something with "high" compression like xz or lzma, since they> First tests showed that it was really slow for normal use, but for > backup purposes it might be not that bad.-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html