Re: loop device memory usage

[Jari Ruusu <jari.ruusu@pp.inet.fi>]

Newsmail wrote:
> how is this preallocation calculated, is there any way to tweak it? :> or I
> presume its tweaked already. does it matter how big the filesystem on top
> the loop device is, how many writes do we have simultaneously, how fast do
> we have them(or do we want to have them :)), what is ideal, etcetc.

This is explained in loop-AES' README file. Look for section "Performance
tuning for 2.4 kernels".

As to question of how many simultaneous writes, each device backed loop can
have preallocated number of pages in-flight simultaneously. In-flight
meaning that a request has been sent to underlying driver (ide or scsi), but
underlying driver has not yet acknowledged that request as completed.

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

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