Deadline for video capture

[Con Kolivas <kernel _at_ xxxxxxxxxxx>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi all

I suspected that the anticipatory scheduler might not have been the best 
choice for video capture because of the interruption to writes by reads and 
the subsequent anticipatory delay associated with it.  I have now confirmed 
that booting with the default anticipatory i/o elevator I get many dropped 
frames that I don't get if I boot with elevator=deadline. 

briefly: dual 7200 rpm ATA5 IDE drives in software RAID0

I guess there isn't really a lot to do about this, it's a compromise one way 
or the other. The anticipatory scheduler seems better all round but in this 
large streaming write situation it doesn't seem ideal. Any sysctl settings I 
could use to blunt the anticipation just before I do video capture?

Con
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)

iD8DBQFAD1qzZUg7+tp6mRURAuekAJ9pFVgSLkY7zr4TL7CEfdRfKdp1DQCfUC6T
RnALyU70HgP9AQt8LS4+B6M=
=H3WY
-----END PGP SIGNATURE-----

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo _at_ vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/