Re: [PATCH 1/4] softirq: implement IRQ flood detection mechanism

[Daniel Lezcano]

On 06/09/2019 03:22, Long Li wrote:
[ ... ]
> 

> Tracing shows that the CPU was in either hardirq or softirq all the
> time before warnings. During tests, the system was unresponsive at
> times.
> 
> Ming's patch fixed this problem. The system was responsive throughout
> tests.
> 
> As for performance hit, both resulted in a small drop in peak IOPS.
> With IRQ_TIME_ACCOUNTING I see a 3% drop. With Ming's patch it is 1%
> drop.

Do you mean IRQ_TIME_ACCOUNTING + irq threaded ?


> For the tests, I used the following fio command on 10 NVMe disks: fio
> --bs=4k --ioengine=libaio --iodepth=128
> --filename=/dev/nvme0n1:/dev/nvme1n1:/dev/nvme2n1:/dev/nvme3n1:/dev/nvme4n1:/dev/nvme5n1:/dev/nvme6n1:/dev/nvme7n1:/dev/nvme8n1:/dev/nvme9n1
> --direct=1 --runtime=12000 --numjobs=80 --rw=randread --name=test
> --group_reporting --gtod_reduce=1

-- 
 <http://www.linaro.org/> Linaro.org â Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog