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SubjectRe: [PATCH] Add ext3 data=guarded mode
On (Thu) Apr 16 2009 [15:42:01], Chris Mason wrote:
> Hello everyone,
>
> Here's an updated (v4) patch for ext3 data=guarded mode. The first two
> patches in the series are unchanged, and it looks like Linus pulled them
> in this morning.

I had written a small program that calculates the time needed to allocate
a file and zero it using various methods (posix_fallocate, mmap, 4k-chunk
writes, 8k-chunk writes). I did this on a 20G partition with each method
creating a file 4G in size. The system has 3G RAM. The program that does
this is at

http://fedorapeople.org/gitweb?p=amitshah/public_git/alloc-perf.git;a=blob;f=test-file-zero-alloc-speed.c;hb=HEAD

with the script to run it for the multiple filesystems at

http://fedorapeople.org/gitweb?p=amitshah/public_git/alloc-perf.git;a=blob;f=run_test.sh;hb=HEAD

I have a few results from those runs, time in seconds:

# 4GiB file, kernel b0cbc861a3c05e634520b049b5cc27ad6febb51f

filesystem posix-fallocate mmap chunk-4096 chunk-8192
ext2 74 96 761 81
ext3-writeback 87 97 202 93
ext3-ordered 86 94 134 104
ext4 0 84 120 91
xfs 0 84 274 81
reiserfs 85 84 187 98
btrfs 0 86 121 85

# 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded

filesystem posix-fallocate mmap chunk-4096 chunk-8192
ext3-guarded 85 97 459 90
ext3-writeback 86 95 140 94
ext3-ordered 86 96 277 95
btrfs 0 81 499 93
xfs 0 79 184 84

These were with a desktop running with a few terminal sessions and one
konqueror session (to gauge the times a user will actually see while
working on her desktop).

Running the test in single user mode, I get the following results:

# 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded

filesystem posix-fallocate mmap chunk-4096 chunk-8192
ext3-guarded 84 86 163 91
ext3-writeback 84 88 217 91
ext3-ordered 84 86 226 91
btrfs 0 76 86 79
ext4 0 73 195 76

Amit


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