Re: Low burning speed
181403648/4220336128 ( 4.3%) @6.0x, remaining 11:30 RBU 99.1% UBU 84.6%
209125376/4220336128 ( 5.0%) @6.0x, remaining 10:52 RBU 100.0% UBU 80.8%
232062976/4220336128 ( 5.5%) @5.0x, remaining 10:53 RBU 100.0% UBU 73.1%
241631232/4220336128 ( 5.7%) @2.1x, remaining 11:15 RBU 98.9% UBU 30.8%
256933888/4220336128 ( 6.1%) @3.3x, remaining 11:18 RBU 100.0% UBU 19.2%
So not a single SYNC CACHE? ... Moving on to next probable suspect, unit
lying about available buffer capacity. Open growisofs_mmc.cpp in text
editor, locate lines that read
if (msecs>=0)
{ poll (NULL,0,msecs);
continue;
}
(line #637 in 7.1) and modify it as following:
if (msecs>=0)
{ fprintf(stderr,"--- %d %d %d\n",msecs,bsize,bfree);
poll (NULL,0,msecs);
continue;
}
The drive seems to be willing to run at the speed which
is announced for the first part of the media: 6.0x.
The fact that the drive buffer (UBU) after a short time
of burning has less than 20 % fill indicates that there
is a problem with data transfer from computer to drive.
Well, not necessarily. In growisofs case when unit returns "long write
in progress", it takes a nap for estimated time to drain buffer to 1/2
of its capacity. Then it should be noted that UBU value is *minimum*
observed value for progress indicator update period. So that *if* unit
returns "long write in progress" a lot, it would be normal to observe
UBU lying around 50%. If not below, because system timer doesn't provide
enough accuracy to nail 50% mark exactly. Note that I'm only saying that
UBU values below 50% do not *necessarily* indicate a problem! I'm *not*
saying that it's not a problem indication in *this* case:-)
Effective throughput seems to be about 4.3 MB/second.
This incident here looks quite strange:
1882193920/4220336128 (44.6%) @3.7x, remaining 8:10 RBU 100.0% UBU 26.9%
1883176960/4220336128 (44.6%) @0.2x, remaining 8:13 RBU 100.0% UBU 100.0%
1883176960/4220336128 (44.6%) @0.0x, remaining 8:17 RBU 100.0% UBU 100.0%
1886191616/4220336128 (44.7%) @0.7x, remaining 8:21 RBU 100.0% UBU 15.4%
Drive buffer is reported as full, but there is no
substantial data transfer for a short time.
This usually happens when recording crosses the velocity zone boundary.
Though it's too early if one trusts write performance descriptor [in one
previous posts it was at 112640*2K=230686720]...
This cannot be blamed on a bad throughput.
Maybe the drive buffer ran empty and the drive
decided to wait until it is at 100 % again.
Then it needed some time to speed up disc rotation
again.
Experiment proposal:
Would it work with better speed if you do not
burn the ISO image on the fly but first generate
it in a disk file and afterwards burn that file
to media ?
Also, in case it's not executed as root, try to execute growisofs as root.
For simplicity you could omit the mkisofs run
and just create a dummy file of 4 GB:
dd if=/dev/zero of=/tmp/4gb_of_zeros bs=1M count=4096
(1 GB = count=1024 should suffice too.)
This file could be burned to media by various programs:
growisofs -use-the-force-luke -Z /dev/sr0=/tmp/4gb_of_zeros
Or simply 'growisofs -Z /dev/dvd=/dev/zero'. This will guarantee that
there is no interference from file system. A.
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Re: Low burning speed
Hi, Tomasz Kaptocz wrote: > 181403648/4220336128 ( 4.3%) @6.0x, remaining 11:30 RBU 99.1% UBU 84.6% > 209125376/4220336128 ( 5.0%) @6.0x, remaining 10:52 RBU 100.0% UBU 80.8% > 232062976/4220336128 ( 5.5%) @5.0x, remaining 10:53 RBU 100.0% UBU 73.1% > 241631232/4220336128 ( 5.7%) @2.1x, remaining 11:15 RBU 98.9% UBU 30.8% > 256933888/4220336128 ( 6.1%) @3.3x, remaining 11:18 RBU 100.0% UBU 19.2% The drive seems to be willing to run at the speed which is announced for the first part of the media: 6.0x. The fact that the drive buffer (UBU) after a short time of burning has less than 20 % fill indicates that there is a problem with data transfer from computer to drive. Effective throughput seems to be about 4.3 MB/second. This incident here looks quite strange: > 1882193920/4220336128 (44.6%) @3.7x, remaining 8:10 RBU 100.0% UBU 26.9% > 1883176960/4220336128 (44.6%) @0.2x, remaining 8:13 RBU 100.0% UBU 100.0% > 1883176960/4220336128 (44.6%) @0.0x, remaining 8:17 RBU 100.0% UBU 100.0% > 1886191616/4220336128 (44.7%) @0.7x, remaining 8:21 RBU 100.0% UBU 15.4% Drive buffer is reported as full, but there is no substantial data transfer for a short time. This cannot be blamed on a bad throughput. Maybe the drive buffer ran empty and the drive decided to wait until it is at 100 % again. Then it needed some time to speed up disc rotation again. Experiment proposal: Would it work with better speed if you do not burn the ISO image on the fly but first generate it in a disk file and afterwards burn that file to media ? For simplicity you could omit the mkisofs run and just create a dummy file of 4 GB: dd if=/dev/zero of=/tmp/4gb_of_zeros bs=1M count=4096 (1 GB = count=1024 should suffice too.) This file could be burned to media by various programs: growisofs -use-the-force-luke -Z /dev/sr0=/tmp/4gb_of_zeros cdrecord -v dev=/dev/sr0 /tmp/4gb_of_zeros cdrskin -v dev=/dev/sr0 /tmp/4gb_of_zeros Of course, the result will not be mountable but only bear a lot of 0-bytes. One can verify success by diff /dev/sr0 /tmp/4gb_of_zeros which might report surplus bytes on /dev/sr0. Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Low burning speed
Dnia 26 marca 2008 17:51 Andy Polyakov <[EMAIL PROTECTED]> napisał(a): > >>> Growiso doesn't work properly with LG GSA4163B burner and DVD+RW 8x > >>> discs. Burning speed is about 4x (even when burner speeds up > >>> switching from 4x zone to 8x - it's a ZCLV burner), it's well visible > >>> with K3b. There's no problem with all other types of media, including > >>> DVD-R 8X. > > > > Version 7.0.1 and 7.1, data: big, small, in combination, doesn't > > matter, media: Verbatim made by Mitsubishi and TDK made by Ricoh. Here's > > output: > > > > [EMAIL PROTECTED]:~$ growisofs -Z /dev/hdc /mnt/hda6/WinFast\ > > WorkArea/Poszukiwacze\ Czindici2.avi /mnt/hda6/WinFast\ WorkArea/odessa.avi > > /mnt/hda7/WinFast\ WorkArea/JFK.mpg /mnt/hda7/WinFast\ > > WorkArea/Nieukończony\ cud\ 2.mpg > > WARNING: /dev/hdc already carries isofs! > > About to execute 'mkisofs /mnt/hda6/WinFast WorkArea/Poszukiwacze > > Czindici2.avi /mnt/hda6/WinFast WorkArea/odessa.avi /mnt/hda7/WinFast > > WorkArea/JFK.mpg /mnt/hda7/WinFast WorkArea/Nieukończony cud 2.mpg | > > builtin_dd of=/dev/hdc obs=32k seek=0' > > I: -input-charset not specified, using utf-8 (detected in locale settings) > > /dev/hdc: "Current Write Speed" is 8.2x1352KBps. > > 0.24% done, estimate finish Tue Mar 25 22:09:03 2008 > > 0.49% done, estimate finish Tue Mar 25 21:58:44 2008 > > 0.73% done, estimate finish Tue Mar 25 21:55:19 2008 > > 0.97% done, estimate finish Tue Mar 25 21:53:35 2008 > > 1.21% done, estimate finish Tue Mar 25 21:52:34 2008 > > 1.46% done, estimate finish Tue Mar 25 21:53:01 2008 > > 1.70% done, estimate finish Tue Mar 25 21:52:22 2008 > > 1.94% done, estimate finish Tue Mar 25 21:51:53 2008 > > ... > > ... > > 99.48% done, estimate finish Tue Mar 25 21:55:48 2008 > > 99.72% done, estimate finish Tue Mar 25 21:55:49 2008 > > 99.97% done, estimate finish Tue Mar 25 21:55:49 2008 > > Total translation table size: 0 > > Total rockridge attributes bytes: 0 > > Total directory bytes: 0 > > Path table size(bytes): 10 > > Max brk space used 0 > > 2060711 extents written (4024 MB) > > builtin_dd: 2060720*2KB out @ average 3.6x1352KBps > > /dev/hdc: flushing cache > > /dev/hdc: stopping de-icing > > /dev/hdc: writing lead-out > > 3.6x with below parameters sounds like recording was progressing at 1/2 > of advertised velocity, i.e. started at 3x and then switches to 4x at > about half recording. Question is does it run uniformly at 1/2 or does > speed jump up and down? Read on... > > > And here's output of media info: > > > > [EMAIL PROTECTED]:~$ dvd+rw-mediainfo /dev/hdc > > INQUIRY:[HL-DT-ST][DVDRAM GSA-4163B][A106] > > GET [CURRENT] CONFIGURATION: > > Mounted Media: 1Ah, DVD+RW > > Current Write Speed: 8.0x1385=11080KB/s > > Write Speed #0:8.0x1385=11080KB/s > > Write Speed #1:6.0x1385=8310KB/s > > GET [CURRENT] PERFORMANCE: > > Write Performance: 6.0x1385=8310KB/[EMAIL PROTECTED] -> 112639] > > 8.0x1385=11080KB/[EMAIL PROTECTED] -> 2295103] > > Speed Descriptor#0:02/2295103 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s > > Speed Descriptor#1:02/2295103 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s > > Looks all right... I can think of following reasons (in ascending order > of likelihood). > > 1. Even though so called Page 05 settings should not affect DVD+ > recordings (per MMC specification), unit looks at the page and > misinterprets the settings. This happened before, though not in DVD+RW > context. > > 2. Under high-speed recordings unit lies about available buffer capacity > tricking growisofs to sleep for longer intervals, long enough to drain > the buffer and affect performance. This happened before with some > Pioneer units, and it should be handled, but your unit might lie in yet > more confusing manner. > > 3. growisofs is periodically tricked to issue SYNCHRONIZE CACHE command, > which drains the buffer, which in turn results in idle revolutions, > hence lower performance. > > Could you do following. Download source, unpack some place, open > growisofs_mmc.cpp with text editor, locate line that reads "sync_cache:" > (it's line 665 in 7.1), add following line after it: > > fprintf(stderr,"-- SYNC CACHE %x\n",errcode); > > Then 'make' and run './growisofs -use-the-force-luke=moi -Z /dev/hdc > /mnt/hda6/...' directly from current working directory and collect > output. Questions are: how does speed varies in progress indicator? > Steady or jerky? Do you see SYNC CACHE and if yes, how often and what's > the code? [There is a chance that there will be a lot of SYNC CACHE > lines, don't hesitate to abort recording with Ctrl-C]. How does UBU > value in progress indicator vary? A. > > > I'm not sure how to interpret it so here's the whole output: [EMAIL PROTECTED]:~/instal/dvd+rw-tools-7.1$ ./growisofs -use-the-force-luke=moi -Z /dev/hdc /mnt/hda6/WinFast\ WorkArea/Poszukiwacze\ Czindi
