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    SubjectRe: Burning multiple DVDs at one time
    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.
    Stefan Richter
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