On 2014-10-07 15:28, Grozdan wrote:
Are you using a kernel with CONFIG_PREEMPT=y? I've personally found that that can help hugely with UI sluggishness (and also tends to get better results when doing stuff like live video capture), although to get this you may need to build the kernel yourself. Also, I would suggest trying the deadline I/O scheduler; I've found it provides much better latency than CFQ for most workloads, and you almost certainly don't need I/O priorities. I've actually got a similar setup (FX-8320 @ 4GHz, 16GB DDR3-1600, High-end storage, and a Radeon R7-240 GPU), and had similar issues when doing processing of big (>500MB) images in GIMP, and using a CONFIG_PREEMPT enabled kernel and the deadline I/O scheduler has pretty much resolved all of these issues.Hi,Basically, my problem is this: I'm doing a lot of audio/video encoding on an AMD FX8350. The encoder process always runs at nice 10. Even so, my whole system feels very sluggish. Switching between different app windows and/or virtual desktops takes up usually 3-5 seconds giving the impression that there is not enough processing power. Browsing the web is also severely impacted. I had to tune CFS in order to be (much) more responsive during an encoding session. This has worked out pretty well thus far, but it is my opinion that the user should *not* need to fiddle with buttons to make his system respond fluently even under high load. The below is what I had to do in order to get a snappy system during such load kernel.sched_nr_migrate = 64 kernel.sched_latency_ns = 65000000 kernel.sched_wakeup_granularity_ns = 100000 kernel.sched_min_granularity_ns = 100000 kernel.sched_migration_cost_ns = 7000000 I have tried 3 different kernels, including one compiled myself, but the results are the same Kernels I tried were: 3.11.10, 3.12 and 3.16.4 (self-compiled) My system specs are as follows CPU: AMD FX-8350 @ 4GHz RAM: 16GB DDR1333 GPU: NVIDIA GTX 560 with NV blob driver HDD: Seagate Constellation ES.3 128MB cache Desktop: KDE 4.11
Additionally, try with KDE's 'semantic desktop' functionality turned off, this eats a huge amount of disk and memory bandwidth, and can easily bring a system to it's knees. Furthermore, unless you can reproduce things using nouevau instead of the NV driver, you're not as likely to get a lot of help.
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