Re: [RFC] extents support for EXT3

[Alex Tomas]

>>>>> Ed Sweetman (ES) writes:

 ES> Throughput 221.812 MB/sec 16 procs    ext2
 ES> Throughput 159.495 MB/sec 16 procs    ext3-extents (definitely enabled)
 ES> Throughput 147.598 MB/sec 16 procs    ext3 (patched but disabled)

 ES> There is an obvious improvement, but nothing near the 70+% increase
 ES> you saw.  Subsequent runs run anything from a little lower than above
 ES> for extents to 167MB/s.

it seems one of my scsi drive is a bit broken (caching, at least).
sorry for invalid numbers. on another drive I see following:

w/o extents:
[root@zefir root]# /root/db2.sh 2 16
Throughput 119.199 MB/sec 16 procs
Throughput 106.09 MB/sec 16 procs
Average: 112.64450


with extents:
[root@zefir root]# /root/db2.sh 2 16
Throughput 156.846 MB/sec 16 procs
Throughput 170.591 MB/sec 16 procs
Average: 163.71850

so, this time improvement is about 45%

I can't explain this yet. need to be investigated carefully

 ES> By the way, what's the behavior of opening an existing non-extent file
 ES> and writing and reading to it while the partition is mounted with
 ES> extents enabled?

those files are handled usual way

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