linux-kernel - Re: Burning multiple DVDs at one time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120317095644.145d0588@stein>
Date:	Sat, 17 Mar 2012 09:56:44 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Wakko Warner <wakko@...mx.eu.org>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: 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. https://lkml.org/lkml/2012/2/28/230
-- 
Stefan Richter
-=====-===-- --== =---=
http://arcgraph.de/sr/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/