+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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