> The sd_iostats code uses spin_lock_irqsave() to ensure consistent data > structure access in interrupt context, so > possibly this is causing the performance impact. The impact might be more > severe if there are many cores on the server.
Thanks Andreas, that's a more realistic explanation... > The sd_iostats patch is completely optional, and is no longer in the RHEL6 > kernel patch series in the Lustre > 2.1/2.2 releases. It has also been removed from SLES11 kernel patch series in Lustre 1.8.7 release but for another reason (Bugzilla - Bug #23988). Cheers, Denis _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
