Hi Artem, > -----Original Message----- > From: Artem Bityutskiy [mailto:[email protected]] > Sent: Monday, April 15, 2013 7:57 AM > To: Counihan, Tom > Cc: [email protected] > Subject: Re: [IVI] IOSCHED_CFQ vs. IOSCHED_NOOP > > > Your request is about making Noop or Deadline to be the default. I am > generally fine with it, but I'd like to make it more consciously.
Makes perfect sense. What was it about CFQ that made it default originally? > > I'd probably put it this way: the I/O scheduler which allows for the fastest > system boot should be made the default one in Tizen IVI. Do you agree? I would also add wear levelling and file system consistency as a criteria. What I mean is under the scenario of cranking, where power flux will be drastic and result in an immediate reboot. On the topic of Fastboot - I need to take a look, but is sreadahead employed? > If > not, what would be your criteria? My point is that there is no best I/O > scheduler, the workload is the primary defining factor, and the HW (SSD vs > HDD, etc) is the second defining factor. > > Anyway, if you agree with my criteria, then I'd say that the current Tizen IVI > distro is not really ready for tuning the boot time yet, so I do not think we > can > make the right decision right now, and therefor I'd leave the CFQ to be the > default so far. And as I said, one can switch the scheduler for a specific > device > using the sysfs switch, or even make a udev rule which will assign the I/O > scheduler for a specific device. Understood - reject the patch I submitted over the weekend so I guess. Warm Regards Tom -------------------------------------------------------------- Intel Shannon Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 Business address: Dromore House, East Park, Shannon, Co. Clare This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. _______________________________________________ IVI mailing list [email protected] https://lists.tizen.org/listinfo/ivi
