Much appreciate your suggestion. I've modified the patch based on your
advice and sent out a new patch with new subject "Btrfs: send, apply
asynchronous
page cache readahead to enhance page read".
Filipe Manana 於 2017-09-13 18:45 寫到:
On Wed, Sep 13, 2017 at 7:38 AM, peter
From: Kuanling Huang
By analyzing the perf on btrfs send, we found it take large
amount of cpu time on page_cache_sync_readahead. This effort
can be reduced after switching to asynchronous one. Overall
performance gain on HDD and SSD were 9 and 15 percent if
simply send a large file.
Signed-off-
Hi Pasi
Sorry for missing the word.
9 and 15 percent performance gain on HDD and SSD after
the patch is applied.
Kuanling
Pasi Kärkkäinen 於 2017-09-13 17:33 寫到:
Hi,
On Wed, Sep 13, 2017 at 02:38:49PM +0800, peterh wrote:
From: Kuanling Huang
By analyzing the perf on btrfs send, we found
From: Kuanling Huang
By analyzing the perf on btrfs send, we found it take large
amount of cpu time on page_cache_sync_readahead. This effort
can be reduced after switching to asynchronous one. Overall
performance gain on HDD and SSD were 9 and 15 respectively if
simply send a large file.
Signed
