Hello,
Looking for what more stuff can be made modular, I'd like to make
IOSCHED_NOOP the default, builtin scheduler and make all other IO
schedulers modules. Current default is the anticipatory one. From
linux/block/Kconfig.iosched:
config IOSCHED_NOOP
bool
default y
---help---
The no-op I/O scheduler is a minimal scheduler that does
basic merging
and sorting. Its main uses include non-disk based block
devices like
memory devices, and specialised software or hardware
environments
that do their own scheduling and require only minimal
assistance from
the kernel.
config IOSCHED_AS
tristate "Anticipatory I/O scheduler"
default y
---help---
The anticipatory I/O scheduler is generally a good choice for
most
environments, but is quite large and complex when compared to
the
deadline I/O scheduler, it can also be slower in some cases
especially some database loads.
IMHO, noop's description is good enough for builtin flash and flash
cards. I have no idea why IOSCHED_AS is used (pristine default is
IOSCHED_CFQ), but it is the same as used by linux-rp, so I assume
that's where it come from. So, I cc: Richard Purdie to ask if there're
good grounds for that and to draw attention that it's a chance to
recover some 5K for kernelspace-starving Z devices.
--
Best regards,
Paul mailto:[EMAIL PROTECTED]
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