Re: 3ware disk latency?

[Jan Kasprzak <kas@fi.muni.cz>]

dean gaudet wrote:
: my suspicion is the 3ware lacks any sort of "fairness" in its sharing of 
: buffer space between multiple units on the same controller.  and by 
: disabling the write caching it limits the amount of controller memory that 
: the busy disk can consume.

	Hmm, do you have a battery backup unit for 9550sx? I don't,
and the 3ware BIOS does not even allow me to enable write caching without it.
So I don't think the write caching on the controller side is related
to my problem.

	I have been able to improve the latency by upgrading the firmware
to the newest release (wow, they even have a firmware updating utility
for Linux!).

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/    Journal: http://www.fi.muni.cz/~kas/blog/ |
> I will never go to meetings again because I think  face to face meetings <
> are the biggest waste of time you can ever have.        --Linus Torvalds <
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/