NCQ high speed data integrity issues

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I am running into data integrity issues while running sgp_dd ver 1.20
against any sg device while running 31 threads.
kernel 2.6.28 Ubuntu.
When running it in slow speed (20 MB/s) all runs well.
When pushing it towards the 50MB/s , Data integrity issues appear.

When running it against sd devices - no integrity issues , but bpt is
not determined and changes .

Any idea how to fix the sg data integrity issues?

Thanks

Dan Porat
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