Alan Cox wrote:
> On Tue, Jun 10, 2008 at 09:49:16AM -0500, Eric Sandeen wrote:
>> if (unlikely(bio_barrier(bio))) {
>> bio_endio(bio, -EOPNOTSUPP);
>> return 0;
>> }
>>
>> ... and somebody should probably measure the lvm overhead in general, I
>> suppose. :)
>
> About 30% for disk performance on my test box. Obviously that isn't all
> some LVM code corner case and there are other problems in there to reach
> that difference on dbench. That's FC8 and I believe some lvm fixes for
> performance have occurred since I did the runs (FC8 no updates).
>
> Alan
>
quick test; fast hardware raid on fibrechannel, 4 cpu opteron, 8G
memory, 4-threaded dbench for 600s, 120s warmup, 500G ext3 fs, 2.6.26-rc2.
ext3 on /dev/sdc:
Throughput 679.495 MB/sec 4 procs
ext3 on /dev/mapper/myvg-lvol0 on /dev/sdc:
Throughput 665.599 MB/sec 4 procs
-Eric
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