On Mar 15 Wakko Warner wrote: > I'm having problems doing this. > > When I burn a single disk, wodim shows the drive buf @ 99% consistently. > The instant that a 2nd disk is being burned, the drive buf on the first one > starts to drop and data stops when the 2nd wodim is performing OPC. > > During the burn of both discs, the drive buf will drop on both until one of > them finishes. Both drives see under runs. > > When one starts fixating, the other will hang until the fixation is > completed. > > During the burns, the fifo of both never drop below 99% > > There are no logs that are produced. > > My burners are: > [6:0:0:0] cd/dvd ATAPI iHAS422 8 4L11 /dev/sr7 > [7:0:0:0] cd/dvd ATAPI iHAS224 B GL05 /dev/sr8 > > Both are SATA drives attached to the onboard sata controller > 00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB SATA AHCI Controller (rev 09) > 00:1f.2 0106: 8086:2681 (rev 09) > > The kernel is a vanilla kernel v3.0.0. (This also happened with 2.6.35) > > I don't believe it matters, but the data is coming over NFS via gigabit > ethernet. Each burn process uses a 768M host buffer. As I stated, the host > fifo on wodim never goes below 99% > > The system motherboard is a SuperMicro X7DA8 This is likely due to serialization by a global mutex in the sr driver. Have a look at thread "[PATCH] [SCSI] sr: fix multi-drive performance, remove BKL replacement" from February. https://lkml.org/lkml/2012/2/28/230 -- Stefan Richter -=====-===-- --== =---= http://arcgraph.de/sr/ -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
