Hi, On (25/06/20 12:09), Richard Chang wrote: > Hi Sergey, > The main idea is to replace submit_bio_wait() to submit_bio(), remove > the one-by-one IO, and rely on the underlying backing device to handle > the asynchronous IO requests. > From my testing results on Android, the idle writeback speed increased 27%. > > idle writeback for 185072 4k-pages (~723 MiB) > $ echo all > /sys/block/zram0/idle > $ time echo idle > /sys/block/zram0/writeback > > Async writeback: > 0m02.49s real 0m00.00s user 0m01.19s system > 0m02.32s real 0m00.00s user 0m00.89s system > 0m02.35s real 0m00.00s user 0m00.93s system > 0m02.29s real 0m00.00s user 0m00.88s system > > Sync writeback: > 0m03.09s real 0m00.00s user 0m01.07s system > 0m03.18s real 0m00.00s user 0m01.12s system > 0m03.47s real 0m00.00s user 0m01.16s system > 0m03.36s real 0m00.00s user 0m01.27s system Has this been tested on exactly same data sets? page-to-page comparable? We decompress before writeback, so if the data had different compression ratios, different number of incompressible objects, etc. then the results are not directly comparable.
