Re: [PATCH for-next 00/32] spin lock usage optimization for SCSI drivers

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

 



Hi Xiaofei,

On Sun, Feb 7, 2021 at 12:46 PM Xiaofei Tan <tanxiaofei@xxxxxxxxxx> wrote:
> Replace spin_lock_irqsave with spin_lock in hard IRQ of SCSI drivers.
> There are no function changes, but may speed up if interrupt happen
> too often.

I'll bite: how much does this speed up interrupt processing?
What's the typical cost of saving/disabling, and restoring interrupt
state?  Is removing this cost worth the risk of introducing subtle
regressions on platforms you cannot test yourself?

BTW, how many of these legacy SCSI controllers do you have access to?

Thanks for your answers!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]

  Powered by Linux