Re: Expense of read_iter

2021-01-21 Thread Zhongwei Cai
On Wed, 20 Jan 2021, Jan Kara wrote: > On Wed 20-01-21 15:47:00, Dave Chinner wrote: > > On Fri, Jan 15, 2021 at 05:40:43PM +0800, Zhongwei Cai wrote: > > > On Thu, 14 Jan 2021, Mikulas wrote: > > > For Ext4-dax, the overhead of dax_iomap_rw is significant >

Re: Expense of read_iter

2021-01-15 Thread Zhongwei Cai
On Thu, 14 Jan 2021, Mikulas wrote: >> I'm working with Mingkai on optimizations for Ext4-dax. > > What specific patch are you working on? Please, post it somewhere. Here is the work-in-progress patch: https://ipads.se.sjtu.edu.cn:1312/opensource/linux/-/tree/ext4-read It only contains the

Re: Expense of read_iter

2021-01-12 Thread Zhongwei Cai
I'm working with Mingkai on optimizations for Ext4-dax. We think that optmizing the read-iter method cannot achieve the same performance as the read method for Ext4-dax. We tried Mikulas's benchmark on Ext4-dax. The overall time and perf results are listed below: Overall time of 2^26 4KB read.