+Alex Lemberg

> -----Original Message-----
> From: Luca Porzio (lporzio)
> Sent: Tuesday, 20 October, 2015 10:05
> To: linux-f2fs-devel@lists.sourceforge.net
> Cc: Ulf Hansson (ulf.hans...@linaro.org); (alexey.skida...@sandisk.com);
> an...@tuxera.com; jaeg...@kernel.org
> Subject: REQ_META and Reliable write in eMMC
> 
> Hi,
> 
> By discussing in the MELS (Mobile & Embedded Linux Storage Forum) we are
> deciding whether it is ok to remove the bonding between REQ_META and
> "Reliable Write" in eMMC devices.
> We already got a first positive ack from FS developers here
> http://comments.gmane.org/gmane.linux.file-systems/97219
> 
> >This performance impact comes from the existing MMC SW driver solution
> where each IO request marked with
> >REQ_META is handled as a "Reliable Write" operation.
> >Pretty much as a as a FUA write access, a "Reliable write" means that the
> data will be written to the
> >non-volatile memory.
> >Due to the fact that every REQ_META is immediately bypassing the internal
> cache of eMMC device, write
> >performance is affected significantly.
> 
> Wanted also to check for side effects on F2FS.
> Please advise how critical is to send REQ_META as "Reliable Write"?
> Can REQ_META be sent as a regular Write operation?
> 
> Thanks,
>    Luca Porzio
>    Micron

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