Re: [PATCH RFC V2 3/3] scsi_mq: enable runtime PM

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jul 18, 2018 at 08:06:10PM +0800, Ming Lei wrote:
> IMO the problem isn't related with slow or quick device, it is related with
> the system, especially when it cares about power consumption, such as
> mobile phone, or laptop or servers with lots of disks attached. And we know
> it is often to see some fast disks shipped in laptop, such as NVMe, or other
> SSD.

Yes but you're only taking locally attached devices into account.
This is very likely harmful on sd devices attached to a
SRP/FC/iSCSI/SAS Target in a SAN environment. These can be really fast
and people investing this money are likely to not like additional
performance penalties. 

Furthermore I'd don't know if any array vendors actually implement
START/STOP DISK, etc..

-- 
Johannes Thumshirn                                          Storage
jthumshirn@xxxxxxx                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux