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New command -scsi_dev_family, new -as cdrecord option drive_scsi_dev_family=

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This commit is contained in:
Thomas Schmitt
2016-03-18 13:55:09 +00:00
parent e51a00f000
commit 3664cab771
19 changed files with 337 additions and 119 deletions
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24
xorriso/xorrecord.1
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@ -9,7 +9,7 @@
.\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1)
.TH XORRECORD 1 "Version 1.4.3, Feb 05, 2016"
.TH XORRECORD 1 "Version 1.4.3, Mar 18, 2016"
.\" Please adjust this date whenever revising the manpage.
.\"
.\" Some roff macros, for reference:
@ -527,6 +527,25 @@ Afterwards end emulation without performing any drive operation.
Only if used as first command line argument this option
prevents reading and interpretation of startup files. See section FILES below.
.TP
\fBdrive_scsi_dev_family=sr|sdc|sg|default\fR
GNU/Linux specific:
.br
By default, cdrskin tries to map Linux drive addresses to /dev/sr* before
they get opened for operating the drive. This coordinates well with
other use cases of optical drives, like mount(8). But since year 2010
all /dev/sr* share a global lock which allows only one drive to process
an SCSI command while all others have to wait for its completion.
This yields awful throughput if more than one drive is writing or reading
simultaneously.
.br
The global lock is not applied to device files /dev/sg* and also not with
the system calls read(2), write(2). But ioctl(SG_IO) is affected, which is
needed to perform the SCSI commands for optical burning.
.br
So for simultaneous burn runs on modern GNU/Linux it is advisable to use
drive_scsi_dev_family="sg". The drive addresses may then well be given as
/dev/sr* but will nevertheless get used as /dev/sg*.
.TP
\fB--grow_overwriteable_iso\fR
Enable emulation of multi\-session writing on overwriteable media which
contain an ISO 9660 filesystem. This emulation is learned from growisofs \-M
@ -589,7 +608,8 @@ reaches a given low percentage value.
This can ease the load on operating system and drive controller and thus help
with achieving better input bandwidth if disk and burner are not on independent
controllers (like hda and hdb). It may also help with simultaneous burns on
different burners with Linux kernels like 3.16. On the other hand it increases
different burners with Linux kernels like 3.16, if one has reason not to fix
the problem by drive_scsi_dev_family="sg". On the other hand it increases
the risk of buffer underflow and thus reduced write speed.
.br
Some burners are not suitable because they