On Thu, Apr 12, 2012 at 11:08:19PM -0700, Darren Hart wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 04/12/2012 10:51 PM, Martin Jansa wrote: > > > And my system is very slow compared to yours, I've found my > > measurement of core-image-minimal-with-mtdutils around 95 mins > > http://patchwork.openembedded.org/patch/17039/ but this was with > > Phenom II X4 965, 4GB RAM, RAID0 (3 SATA2 disks) for WORKDIR, RAID5 > > (the same 3 SATA2 disks) BUILDDIR (raid as mdraid), now I have > > Bulldozer AMD FX(tm)-8120, 16GB RAM, still the same RAID0 but > > different motherboard.. > > Why RAID5 for BUILDDIR? The write overhead of RAID5 is very high. The > savings RAID5 alots you is more significant with more disks, but with > 3 disks it's only 1 disk better than RAID10, with a lot more overhead.
Becaure RAID10 needs at least 4 drivers and all my SATA ports are already used and also it's on my /home partition.. please not that this is not some company build server, just my desktop where it happens I do a lot of builds for comunity distribution for smartphones http://shr-project.org Server we have available for builds is _much_ slower then this especially IO (some virtualized host on busy server), but has much better network bandwidth.. :). Cheers, > I spent some time outlining all this a while back: > http://www.dvhart.com/2011/03/qnap_ts419p_configuration_raid_levels_and_throughput/ > > Here's the relevant bit: > > "RAID 5 distributes parity across all the drives in the array, this > parity calculation is both compute intensive and IO intensive. Every > write requires the parity calculation, and data must be written to > every drive." > > > > - -- > Darren Hart > Intel Open Source Technology Center > Yocto Project - Linux Kernel > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iQEcBAEBAgAGBQJPh8LTAAoJEKbMaAwKp364pa8H/A8BSudN/g7ixFmUTYMNGHlC > 2+H59MgNHYWRYzNn9QvN6vyyfXzX7C00HUTQ4MQ3CmisTUza2tbJEdX9CpeIBQNg > Ny8iqyNNoInTFx2T1Yi2eA9Ytegtue9Ls+IcBRbpIbs6Zo1Qwzi6oemdPZN7g3YI > rH/NKALWIBt/Y/Dt2k0fz7WsQGYOuE/lYpL/CmukU7vNNEUAdOs7tZa5o1ZOQDuj > zGCwuVH9QwrDJEXNsMtjNY37aJeAgDMwSXjN0pKv1WQI9j47kYQQrrp2qKVQYhV1 > x4QxJ5aOuV7BaS0Y7zYkNo9nv+yKPODt25s5L83k5vjbMhCvczmMJn3jupQuUhQ= > =3GDA > -----END PGP SIGNATURE----- -- Martin 'JaMa' Jansa jabber: martin.ja...@gmail.com
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