Well compiling with -O3 does not seem to have had any increase in 
throughput for me. :(  I'll be moving back to the recommended -O2 after 
these jobs finish.

Brian-

On 11/9/2011 8:23 AM, Cejka Rudolf wrote:
> Marcio Merlone wrote (2011/11/09):
>> Em 09-11-2011 09:26, Cejka Rudolf escreveu:
>>> Cejka Rudolf wrote (2011/11/09):
>>>>     does anybody have any idea, why after upgrade from Bacula 2.4.3 to 
>>>> 5.0.3,
>>>> tape write speed dropped down from about 70-120 MB/s (LTO-3 tape limits)
>>>> to just 60-70 MB/s? I think that I have seen somewhere, that something
>>>> (signatures?) has been moved from clients or director to storage daemon,
>>>> but could not find it anymore. Or could be the problem somewhere else?
>>> Oops, I'm sorry, I forgot to add -O3. After returning -O3, I can
>>> see again speeds over 100 MB/s.
>> Please enlighten me (us?): Where did you add -03 to improve the speed? I
>> have an LTO-4 drive and get no more than 50~60 MB/s!
> Hello, before compilation, instead of
>
> ./configure ...
>
> try to use
>
> CFLAGS=-O3 ./configure ...
>
> and then see your tape drive more happy ;o)
> If there are no bugs caused by -O3...
>
> If Bacula behavior did not change since 2.4.3, the main limiting
> factor to achieve higher throughput on LTO tapes, is in CRC32
> computations performed between disk spool reads and tape writes.
>


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