ac3100 512mB mem,merlin .65 firmware.downloadmaster on usb 2.0 disk.
kernel setting:min_free_kbytes=20480.
take the upload speed as example:
1,when mem's free reach the lowest 70mB,the up speed change to 40KB/s from above 1024KB/s. then,when some time elapse ,such as 2 min,the mem's free suddenly reach high, and meantime up speed resume to the normal up speed above 1024KB/s.
2,when i force refresh the downloadmaster webpage,the mem reclaimed and meantime the up speed resume to normal
3,the min_free_kbytes value did not relate the issue.because when chang the value to high or low,only the lowest free mem change.but when the free amount reach the lowest ,the up speed also reduce suddenly.
4,the issue is not be related with the dirty pagecache.becasue we only upload.
5,the issue is not be related with the swap
6, only find the pagecache unactive(file) amount reach the highest,the up speed go down to 40KB/s.
7,we can drop cache by echo 1 >/proc/sys/vm/drop_caches to reclaime the unactive(file) page cache. but this method is not elagant.
8,the mem reclaim issue also impact the download speed,like as the up speed.
9,disable nat accleat or enable dose not fix the issuse
How we reclaim the pagecache timely so the up speed smoothy?
kernel setting:min_free_kbytes=20480.
take the upload speed as example:
1,when mem's free reach the lowest 70mB,the up speed change to 40KB/s from above 1024KB/s. then,when some time elapse ,such as 2 min,the mem's free suddenly reach high, and meantime up speed resume to the normal up speed above 1024KB/s.
2,when i force refresh the downloadmaster webpage,the mem reclaimed and meantime the up speed resume to normal
3,the min_free_kbytes value did not relate the issue.because when chang the value to high or low,only the lowest free mem change.but when the free amount reach the lowest ,the up speed also reduce suddenly.
4,the issue is not be related with the dirty pagecache.becasue we only upload.
5,the issue is not be related with the swap
6, only find the pagecache unactive(file) amount reach the highest,the up speed go down to 40KB/s.
7,we can drop cache by echo 1 >/proc/sys/vm/drop_caches to reclaime the unactive(file) page cache. but this method is not elagant.
8,the mem reclaim issue also impact the download speed,like as the up speed.
9,disable nat accleat or enable dose not fix the issuse
How we reclaim the pagecache timely so the up speed smoothy?
