| Summary: | X consume a lot of CPU during window resize | ||
|---|---|---|---|
| Product: | xorg | Reporter: | razrfalcon |
| Component: | Driver/nVidia (proprietary) | Assignee: | Aaron Plattner <aplattner> |
| Status: | NEW --- | QA Contact: | Aaron Plattner <aplattner> |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | unspecified | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
I've tried a fresh Arch Linux installation today - same lags. I've also tried to profile X with perf.
During resize:
PerfTop: 2762 irqs/sec kernel:91.6% exact: 0.0% [4000Hz cycles], (target_pid: 4685)
----------------------------------------------------------------------------------------------
38.53% [nvidia] [k] _nv028452rm
35.24% [kernel] [k] pci_conf1_read
6.14% [nvidia] [k] _nv017381rm
1.12% [kernel] [k] _raw_spin_lock_irqsave
0.97% [nvidia] [k] _nv009414rm
0.81% [kernel] [k] _raw_write_unlock_irqrestore
0.62% [kernel] [k] preempt_count_sub
0.41% nvidia_drv.so [.] 0x00000000000a0b70
0.41% [kernel] [k] preempt_count_add
0.35% [vdso] [.] 0x0000000000000909
0.31% [nvidia] [k] _nv017360rm
0.27% [nvidia] [k] _nv017552rm
0.26% nvidia_drv.so [.] 0x00000000000d1d72
0.25% [vdso] [.] __vdso_gettimeofday
0.24% nvidia_drv.so [.] 0x00000000000d1ca1
0.24% nvidia_drv.so [.] 0x00000000000d1c90
0.20% [nvidia] [k] _nv019905rm
0.20% nvidia_drv.so [.] 0x00000000000d1cad
0.19% nvidia_drv.so [.] 0x00000000000cf022
0.18% [nvidia] [k] _nv030640rm
0.18% nvidia_drv.so [.] 0x00000000000d1c04
0.17% [nvidia] [k] 0x0000000000341de2
0.17% [kernel] [k] page_fault
0.16% nvidia_drv.so [.] 0x00000000000d1c53
0.16% [nvidia] [k] 0x00000000003cad5d
0.16% nvidia_drv.so [.] 0x00000000000d1c69
0.16% [nvidia] [k] _nv024815rm
0.16% [nvidia] [k] _nv019581rm
0.16% nvidia_drv.so [.] 0x00000000000d1d2d
0.16% nvidia_drv.so [.] 0x00000000000d1d27
Usual work:
PerfTop: 118 irqs/sec kernel:13.6% exact: 0.0% [4000Hz cycles], (target_pid: 4685)
----------------------------------------------------------------------------------------------
11.97% [vdso] [.] 0x0000000000000909
8.92% [vdso] [.] __vdso_gettimeofday
8.57% [nvidia] [k] _nv028452rm
8.44% [kernel] [k] pci_conf1_read
3.77% nvidia_drv.so [.] 0x00000000000cf022
2.05% nvidia_drv.so [.] 0x000000000005e66e
1.74% nvidia_drv.so [.] 0x00000000000b4c7e
1.56% [nvidia] [k] _nv017381rm
1.53% [vdso] [.] 0x0000000000000907
1.49% nvidia_drv.so [.] 0x00000000000a0b70
1.11% nvidia_drv.so [.] 0x00000000000d1c90
1.09% nvidia_drv.so [.] 0x00000000000d1c50
1.01% nvidia_drv.so [.] 0x00000000000d1c6a
0.97% nvidia_drv.so [.] 0x00000000000d1d72
0.96% nvidia_drv.so [.] 0x00000000000d1cad
0.79% nvidia_drv.so [.] 0x00000000000d1c69
0.78% nvidia_drv.so [.] 0x00000000000d1c04
0.75% nvidia_drv.so [.] 0x00000000000d1ca1
0.70% nvidia_drv.so [.] 0x00000000000d1d12
0.63% nvidia_drv.so [.] 0x000000000005e654
0.59% nvidia_drv.so [.] 0x00000000000d1d2d
0.58% nvidia_drv.so [.] 0x00000000000d1c53
0.57% nvidia_drv.so [.] 0x00000000000d1d27
0.56% nvidia_drv.so [.] 0x00000000000d1d20
0.56% nvidia_drv.so [.] 0x00000000000d1dd1
0.52% nvidia_drv.so [.] 0x00000000000d1c59
0.52% [vdso] [.] 0x000000000000091c
0.52% nvidia_drv.so [.] 0x000000000005e667
0.50% nvidia_drv.so [.] 0x00000000000d2493
0.49% [kernel] [k] preempt_count_add
Looks like most of the CPU cycles are spent in the nvidia kernel driver. I've updated nvidia driver from 384.90 to 387.12. Now X eats only ~20% (not 25%) of the CPU, which made lags a lot smaller, but they are still very visible. I'm comparing to Win10, which is not fair, but it has zero lags. |
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During a window resize X consume a single CPU core completely leading to huge lags. GPU usage according to nvidia-smi is 20-30%. There are no warnings/errors in /var/log/Xorg.0.log, dmesg, ~/.local/share/sddm/xorg-session.log. The only custom option is Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }" in xorg.conf Lags doesn't depend on toolkit. gtk2/3 and qt4/5 behaves the same. ForceFullCompositionPipeline doesn't remove lags either. From where can I start to investigate performance issues source? Gentoo Linux stable x86_64, KDE 5.10.5, i5 3570k@3.4, nVidia GTX 960 4GB (driver 384.90), xorg-server 1.19.4.