| Bug ID | 100941 |
|---|---|
| Summary | Improve time to suspend on |
| Product | DRI |
| Version | DRI git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/Radeon |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | paulepanter@users.sourceforge.net |
Created attachment 131223 [details]
TML page generated by pm-graph (`sudo ./analyze_suspend.py -config
config/suspend-callgraph.cfg`)
The ASRock E350M1 has a Radeon HD 6310.
```
$ sudo lspci -s 0:01.0 -nn -v
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Wrestler [Radeon HD 6310] [1002:9802] (prog-if 00 [VGA controller])
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD
6310] [1002:9802]
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at e0000000 (32-bit, prefetchable) [size=256M]
I/O ports at 2000 [size=256]
Memory at f0100000 (32-bit, non-prefetchable) [size=256K]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
Kernel driver in use: radeon
Kernel modules: radeon
```
With Debian Sid/unstable with Linux 4.9.25 suspend and resume times are
benchmarked with pm-graph [1], and the command below.
```
sudo ./analyze_suspend.py -config config/suspend-callgraph.cfg
```
It turns out that with 258 ms the radeon module takes the majority of the time
during suspend.
In that cycle one `radeon_bo_evict_vram` call takes the longest with 198 ms.
```
[…]
459.186778 | 0) kworker-1495 | 0.974 us |
radeon_fence_wait_empty [radeon]();
459.186780 | 0) kworker-1495 | 0.440 us |
radeon_fence_wait_empty [radeon]();
459.186783 | 0) kworker-1495 | 0.501 us |
radeon_fence_wait_empty [radeon]();
459.186785 | 0) kworker-1495 | 5.424 us |
radeon_save_bios_scratch_regs [radeon]();
459.186793 | 0) kworker-1495 | 7625.511 us | evergreen_suspend
[radeon]();
459.194422 | 0) kworker-1495 | 10.158 us |
evergreen_hpd_fini [radeon]();
459.194434 | 0) kworker-1495 | 198203.3 us |
radeon_bo_evict_vram [radeon]();
[…]
```
Please see the attached files for more details.
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