I've been chasing some performance issues on a recently reinstalled
Fedora system and I think I've identified the problem along with what
maybe an incomplete or not fully optimized solution.
The problem started when I had upgraded to Fedora 35 the upgrade went
south with the booting of the OS, grub for whatever reason reverted to
trying to boot a very old kernel that didn't exist. I figured the
easiest and fastest way was to simply reinstall the OS, retaining my
/home partition. The re-installation went fine however performance
SUCKED, it so so bad that using firefox, thunderbird, and chrome I could
type faster than the system can display characters on the screen.
Apparently quite some time ago I had put in some options into grub that
enabled optimizations with the i915 graphics chipset and had forgotten
about it. So after a lot of digging I have added to the
GRUB_CMDLINE_LINUX line in the /etc/default/grub file:
i915.enable_rc6=7 i915.enable_fbc=1 i915.lvds_downclock=1
i915.semaphores=1
This seems to have given me a dramatic boost in system performance, and
I no longer have lag when I'm typing, the system is loading web pages
etc a whole lot faster, and CPU usage is way down.
Now I'm not confident I have the best options enabled for my system with
its i915 chipset and I'm also not sure I have added it in the correct
location.
The system is an older laptop, Lenovo T440P (4th gen i7)
hwinfo identifies the i915 as the following:
33: PCI 02.0: 0300 VGA compatible controller (VGA)
[Created at pci.386]
Unique ID: _Znp.rz2n9XAjpu9
SysFS ID: /devices/pci0000:00/0000:00:02.0
SysFS BusID: 0000:00:02.0
Hardware Class: graphics card
Model: "Intel 4th Gen Core Processor Integrated Graphics
Controller"
Vendor: pci 0x8086 "Intel Corporation"
Device: pci 0x0416 "4th Gen Core Processor Integrated
Graphics Controller"
SubVendor: pci 0x17aa "Lenovo"
SubDevice: pci 0x221d
Revision: 0x06
Driver: "i915"
Driver Modules: "i915"
Memory Range: 0xf3000000-0xf33fffff (rw,non-prefetchable)
Memory Range: 0xc0000000-0xdfffffff (ro,non-prefetchable)
I/O Ports: 0x4000-0x403f (rw)
Memory Range: 0x000c0000-0x000dffff
(rw,non-prefetchable,disabled)
IRQ: 35 (10229876 events)
Module Alias:
"pci:v00008086d00000416sv000017AAsd0000221Dbc03sc00i00"
Driver Info #0:
Driver Status: i915 is active
Driver Activation Cmd: "modprobe i915"
Config Status: cfg=new, avail=yes, need=no, active=unknown
I also see the following in the kernel log (as pulled from hwinfo)
<3>[ 38.067230] i915 0000:00:02.0: [drm] *ERROR* mstb
00000000b560c211 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
Any suggestions on tweaking the i915 configuration would be appreciated_______________________________________________
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