in-line :- On 01/02/2017, Lennart Sorensen <lsore...@csclub.uwaterloo.ca> wrote: > On Wed, Feb 01, 2017 at 12:46:48AM +0530, shirish शिरीष wrote:
<snipped> >> Now I have few queries - >> >> a. Are my assumptions wrong ? > > About the doing the init on a future boot, yes you are wrong. Ah...ok. <snipped> > > 2.6.37 apparently. My bad ... <snipped> > > I believe it is on by default. However, the lazy init takes > place in the background on first mount (so that means during > the install), not some later boot. It apparently will use > up to 16MB/s for initializing in the background according to > https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem > > I suspect it is already doing the best you are going to get. hmm.... From what little I understand, it always the slowest interface that needs to be supported. And IIUC , in ext4lazyinit's case it is probably some of the MMC cards due to which the 16 MB/S transmission is kept - although some of them are at 104 MB/S as well. https://en.wikipedia.org/wiki/MultiMediaCard#Table Whereas USB are at - https://en.wikipedia.org/wiki/USB_3.1 USB 2.0 - 35 MB/S USB 3.0 - 400 MB/S USB 3.1 - Gen 1 - 400 MB/S USB 3.2 - Gen 2 - 1280 MB/S For HDD - https://en.wikipedia.org/wiki/Serial_ATA SATA 1 - starts at 150 MB/S Another query - if instead ext4lazyinit IF - mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/mapper/fc-root is applied then would it would start formatting and making inodes at a much faster rate - i.e. slowest between the USB Drive and HDD in a typical workstation - which probably would be a jump 3-4 times the speed that ext4lazyinit would employ. WDYT ? If yes, how as a user could I apply/use the above command while using debian-installer ? > -- > Len Sorensen > -- Regards, Shirish Agarwal शिरीष अग्रवाल My quotes in this email licensed under CC 3.0 http://creativecommons.org/licenses/by-nc/3.0/ http://flossexperiences.wordpress.com EB80 462B 08E1 A0DE A73A 2C2F 9F3D C7A4 E1C4 D2D8