Re: getdents - ext4 vs btrfs performance
From: Jacek Luczak <hidden>
Date: 2012-03-02 14:16:12
Also in:
linux-btrfs, linux-fsdevel, lkml
2012/3/2 Chris Mason [off-list ref]:
On Fri, Mar 02, 2012 at 11:05:56AM +0100, Jacek Luczak wrote:quoted
I've took both on tests. The subject is acp and spd_readdir used with tar, all on ext4: 1) acp: http://91.234.146.107/~difrost/seekwatcher/acp_ext4.png 2) spd_readdir: http://91.234.146.107/~difrost/seekwatcher/tar_ext4_readir.png 3) both: http://91.234.146.107/~difrost/seekwatcher/acp_vs_spd_ext4.png The acp looks much better than spd_readdir but directory copy with spd_readdir decreased to 52m 39sec (30 min less).Do you have stats on how big these files are, and how fragmented they are? For acp and spd to give us this, I think something has gone wrong at writeback time (creating individual fragmented files).
How big? Which files? -Jacek -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html