Re: short term task list for Reiser4

[Hans Reiser <reiser@namesys.com>]

Clay Barnes wrote:

>On 15:04 Tue 11 Jul     , Hans Reiser wrote:
>  
>
>>
>>6) optimize fsync --- substantive task which requires using fixed area
>>for write twice logging, and using write twice logging for fsync'd
>>data.  It might require creating mount options to choose whether to
>>optimize for serialized sequential fsyncs vs. lazy fsyncs.
>>    
>>
>With the serialized sequential fsync, is that essentially what I was
>talking about earlier with slowly streaming dirty writes to disk when
>the HDD is idle?  If that's the case, I don't see the advantage in having
>lazy fsyncs
>
if you are optimizing throughput rather than latency, then you let
things get to disk whenever they get there, and you let the app hang
while it waits. A mailer processing many requests in parallel might find
30 seconds of latency to be just fine but a database might find 3
seconds of latency to be too much. (I make up these examples, mailer
programmers please correct me.)

> except in situations where you want to keep the HDD spun down
>as much as possible.
>
No, that is not when you do it.

>I've been meaning to hose my laptop (assuming I fix one problem with my
>desktop), so I am willing to help write Gentoo install docs (or possibly
>Arch Linux).  I can also test exsiting instructions.
>  
>
That would be way cool.
<http://wiki.namesys.com/Reiser4-GettingStarted#preview>

-
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/