buffer starvation when recording DVDs
Alexander Best
alexbestms at uni-muenster.de
Wed Jul 14 13:25:34 UTC 2010
2010/7/14 Paul B Mahol <onemda at gmail.com>:
> On Wed, Jul 14, 2010 at 12:46 PM, Alexander Best
> <alexbestms at uni-muenster.de> wrote:
>> 2010/7/14 Alexander Best <alexbestms at uni-muenster.de>:
>>> hi there,
>>>
>>> my dvdr drive supports recording DVDs (both DVD-Rs and DVD+Rs) at a
>>> maximum speed of 16x. however at speeds of more than ~12x the burner's
>>> buffer get's filled only ~20%. probably that's why the burner's speed
>>> get's reduced by `growisofs` (to prevent buffer starvation?). how can
>>> this happen? the iso i am using lies on my HDD which is quite fast
>>> (connected via SATA 2.0).
>>>
>>> this is the output of `camcontrol devlist -v`:
>>>
>>> scbus0 on ahcich0 bus 0:
>>> <> at scbus0 target -1 lun -1 ()
>>> scbus1 on ahcich1 bus 0:
>>> <> at scbus1 target -1 lun -1 ()
>>> scbus2 on ata2 bus 0:
>>> <HL-DT-ST DVDRAM GSA-H10N JL12> at scbus2 target 0 lun 0 (cd0,pass0)
>>> <> at scbus2 target -1 lun -1 ()
>>> scbus3 on ahcich2 bus 0:
>>> <SAMSUNG SP2504C VT100-50> at scbus3 target 0 lun 0 (ada0,pass1)
>>> <> at scbus3 target -1 lun -1 ()
>>> scbus4 on ahcich3 bus 0:
>>> <> at scbus4 target -1 lun -1 ()
>>> scbus5 on ahcich4 bus 0:
>>> <> at scbus5 target -1 lun -1 ()
>>> scbus6 on ahcich5 bus 0:
>>> <> at scbus6 target -1 lun -1 ()
>>> scbus7 on ahcich6 bus 0:
>>> <> at scbus7 target -1 lun -1 ()
>>> scbus8 on ahcich7 bus 0:
>>> <> at scbus8 target -1 lun -1 ()
>>> scbus-1 on xpt0 bus 0:
>>> <> at scbus-1 target -1 lun -1 (xpt0)
>>>
>>> as you can see cd0 and ada0 don't share the same cable (cd0 is PATA,
>>> ada0 is SATA). the PATA and SATA controllers are:
>>>
>>> atapci0: <JMicron JMB363 UDMA133 controller> port
>>> 0xd000-0xd007,0xd100-0xd103,0xd200-0xd207,0xd300-0xd303,0xd400-0xd40f
>>> irq 16 at device 0.1 on pci3
>>>
>>> ahci0: <JMicron JMB363 AHCI SATA controller> mem 0xf8000000-0xf8001fff
>>> irq 19 at device 0.0 on pci3
>>
>> sorry for the wrong information. just realized my HDD is connected to
>> the intel controller!
>>
>>>
>>> this is the output of `growisofs`:
>>>
>>> Executing 'builtin_dd if=new.iso of=/dev/pass0 obs=32k seek=0'
>>> /dev/pass0: "Current Write Speed" is 16.4x1352KBps.
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 0/4695924736 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
>>> 1114112/4695924736 ( 0.0%) @0.2x, remaining 2036:44 RBU 100.0% UBU 2.9%
>>> 1114112/4695924736 ( 0.0%) @0.0x, remaining 2247:26 RBU 100.0% UBU 100.0%
>>> 19365888/4695924736 ( 0.4%) @4.0x, remaining 144:53 RBU 100.0% UBU 100.0%
>>> 52789248/4695924736 ( 1.1%) @7.2x, remaining 57:10 RBU 99.9% UBU 100.0%
>>> 86736896/4695924736 ( 1.8%) @7.4x, remaining 37:11 RBU 100.0% UBU 100.0%
>>> 121241600/4695924736 ( 2.6%) @7.5x, remaining 28:55 RBU 100.0% UBU 97.1%
>>> 156336128/4695924736 ( 3.3%) @7.6x, remaining 23:42 RBU 99.9% UBU 97.1%
>>> 191954944/4695924736 ( 4.1%) @7.7x, remaining 20:20 RBU 100.0% UBU 100.0%
>>> 228130816/4695924736 ( 4.9%) @7.8x, remaining 18:16 RBU 100.0% UBU 100.0%
>>> 264863744/4695924736 ( 5.6%) @8.0x, remaining 16:27 RBU 100.0% UBU 100.0%
>>> 298352640/4695924736 ( 6.4%) @7.3x, remaining 15:13 RBU 100.0% UBU 100.0%
>>> 336134144/4695924736 ( 7.2%) @8.2x, remaining 14:16 RBU 100.0% UBU 100.0%
>>> 374505472/4695924736 ( 8.0%) @8.3x, remaining 13:16 RBU 100.0% UBU 100.0%
>>> 413401088/4695924736 ( 8.8%) @8.4x, remaining 12:25 RBU 99.9% UBU 100.0%
>>> 452886528/4695924736 ( 9.6%) @8.6x, remaining 11:52 RBU 100.0% UBU 100.0%
>>> 492896256/4695924736 (10.5%) @8.7x, remaining 11:13 RBU 100.0% UBU 97.1%
>>> 533495808/4695924736 (11.4%) @8.8x, remaining 10:39 RBU 100.0% UBU 97.1%
>>> 574619648/4695924736 (12.2%) @8.9x, remaining 10:16 RBU 99.7% UBU 100.0%
>>> 616333312/4695924736 (13.1%) @9.0x, remaining 9:49 RBU 99.9% UBU 97.1%
>>> 658538496/4695924736 (14.0%) @9.1x, remaining 9:24 RBU 100.0% UBU 94.1%
>>> 701366272/4695924736 (14.9%) @9.3x, remaining 9:06 RBU 100.0% UBU 97.1%
>>> 744751104/4695924736 (15.9%) @9.4x, remaining 8:45 RBU 99.9% UBU 97.1%
>>> 788660224/4695924736 (16.8%) @9.5x, remaining 8:25 RBU 100.0% UBU 97.1%
>>> 833159168/4695924736 (17.7%) @9.6x, remaining 8:11 RBU 100.0% UBU 97.1%
>>> 878182400/4695924736 (18.7%) @9.8x, remaining 7:53 RBU 100.0% UBU 97.1%
>>> 923762688/4695924736 (19.7%) @9.9x, remaining 7:37 RBU 100.0% UBU 97.1%
>>> 969932800/4695924736 (20.7%) @10.0x, remaining 7:25 RBU 100.0% UBU 97.1%
>>> 1011908608/4695924736 (21.5%) @9.1x, remaining 7:13 RBU 100.0% UBU 97.1%
>>> 1059094528/4695924736 (22.6%) @10.2x, remaining 6:58 RBU 100.0% UBU 97.1%
>>> 1106903040/4695924736 (23.6%) @10.4x, remaining 6:48 RBU 100.0% UBU 97.1%
>>> 1155203072/4695924736 (24.6%) @10.5x, remaining 6:35 RBU 100.0% UBU 97.1%
>>> 1204092928/4695924736 (25.6%) @10.6x, remaining 6:22 RBU 99.9% UBU 97.1%
>>> 1253507072/4695924736 (26.7%) @10.7x, remaining 6:13 RBU 100.0% UBU 97.1%
>>> 1303511040/4695924736 (27.8%) @10.8x, remaining 6:01 RBU 100.0% UBU 97.1%
>>> 1354039296/4695924736 (28.8%) @10.9x, remaining 5:50 RBU 100.0% UBU 97.1%
>>> 1405124608/4695924736 (29.9%) @11.1x, remaining 5:41 RBU 100.0% UBU 91.2%
>>> 1456832512/4695924736 (31.0%) @11.2x, remaining 5:31 RBU 99.9% UBU 97.1%
>>> 1509031936/4695924736 (32.1%) @11.3x, remaining 5:21 RBU 100.0% UBU 97.1%
>>> 1561821184/4695924736 (33.3%) @11.4x, remaining 5:13 RBU 99.9% UBU 97.1%
>>> 1615134720/4695924736 (34.4%) @11.6x, remaining 5:03 RBU 100.0% UBU 91.2%
>>> 1669005312/4695924736 (35.5%) @11.7x, remaining 4:53 RBU 100.0% UBU 97.1%
>>> 1723465728/4695924736 (36.7%) @11.8x, remaining 4:46 RBU 100.0% UBU 91.2%
>>> 1778417664/4695924736 (37.9%) @11.9x, remaining 4:37 RBU 100.0% UBU 97.1%
>>> 1834024960/4695924736 (39.1%) @12.0x, remaining 4:28 RBU 99.5% UBU 97.1%
>>> 1884389376/4695924736 (40.1%) @10.9x, remaining 4:22 RBU 100.0% UBU 47.1%
>>> 1941012480/4695924736 (41.3%) @12.3x, remaining 4:14 RBU 99.9% UBU 97.1%
>>> 1998159872/4695924736 (42.6%) @12.4x, remaining 4:05 RBU 100.0% UBU 97.1%
>>> 2055897088/4695924736 (43.8%) @12.5x, remaining 3:58 RBU 96.6% UBU 94.1%
>>> 2113961984/4695924736 (45.0%) @12.6x, remaining 3:50 RBU 100.0% UBU 82.4%
>>> 2172977152/4695924736 (46.3%) @12.8x, remaining 3:42 RBU 100.0% UBU 79.4%
>>> 2232188928/4695924736 (47.5%) @12.8x, remaining 3:36 RBU 100.0% UBU 79.4%
>>> 2292154368/4695924736 (48.8%) @13.0x, remaining 3:28 RBU 100.0% UBU 73.5%
>>> 2352218112/4695924736 (50.1%) @13.0x, remaining 3:21 RBU 99.9% UBU 41.2%
>>> 2406875136/4695924736 (51.3%) @11.8x, remaining 3:15 RBU 100.0% UBU 23.5%
>>> 2462351360/4695924736 (52.4%) @12.0x, remaining 3:09 RBU 100.0% UBU 20.6%
>>> 2512650240/4695924736 (53.5%) @10.9x, remaining 3:04 RBU 100.0% UBU 20.6%
>>> 2568781824/4695924736 (54.7%) @12.2x, remaining 2:58 RBU 99.8% UBU 20.6%
>>> 2625634304/4695924736 (55.9%) @12.3x, remaining 2:52 RBU 99.9% UBU 20.6%
>>> 2682814464/4695924736 (57.1%) @12.4x, remaining 2:46 RBU 100.0% UBU 20.6%
>>> 2740486144/4695924736 (58.4%) @12.5x, remaining 2:41 RBU 99.9% UBU 20.6%
>>> 2785411072/4695924736 (59.3%) @9.7x, remaining 2:37 RBU 99.5% UBU 20.6%
>>> 2840920064/4695924736 (60.5%) @12.0x, remaining 2:31 RBU 100.0% UBU 97.1%
>>> 2896461824/4695924736 (61.7%) @12.0x, remaining 2:26 RBU 100.0% UBU 94.1%
>>> 2951970816/4695924736 (62.9%) @12.0x, remaining 2:21 RBU 100.0% UBU 97.1%
>>> 3007479808/4695924736 (64.0%) @12.0x, remaining 2:15 RBU 99.9% UBU 97.1%
>>> 3063021568/4695924736 (65.2%) @12.0x, remaining 2:11 RBU 99.8% UBU 88.2%
>>> 3118497792/4695924736 (66.4%) @12.0x, remaining 2:05 RBU 100.0% UBU 97.1%
>>> 3174039552/4695924736 (67.6%) @12.0x, remaining 2:00 RBU 100.0% UBU 97.1%
>>> 3229581312/4695924736 (68.8%) @12.0x, remaining 1:56 RBU 99.9% UBU 97.1%
>>> 3285090304/4695924736 (70.0%) @12.0x, remaining 1:51 RBU 100.0% UBU 97.1%
>>> 3340599296/4695924736 (71.1%) @12.0x, remaining 1:46 RBU 100.0% UBU 97.1%
>>> 3396141056/4695924736 (72.3%) @12.0x, remaining 1:41 RBU 99.9% UBU 97.1%
>>> 3451682816/4695924736 (73.5%) @12.0x, remaining 1:36 RBU 99.9% UBU 97.1%
>>> 3507191808/4695924736 (74.7%) @12.0x, remaining 1:32 RBU 100.0% UBU 94.1%
>>> 3562733568/4695924736 (75.9%) @12.0x, remaining 1:27 RBU 100.0% UBU 91.2%
>>> 3618242560/4695924736 (77.1%) @12.0x, remaining 1:23 RBU 100.0% UBU 91.2%
>>> 3673784320/4695924736 (78.2%) @12.0x, remaining 1:18 RBU 100.0% UBU 94.1%
>>> 3729293312/4695924736 (79.4%) @12.0x, remaining 1:14 RBU 100.0% UBU 94.1%
>>> 3784835072/4695924736 (80.6%) @12.0x, remaining 1:09 RBU 100.0% UBU 94.1%
>>> 3840344064/4695924736 (81.8%) @12.0x, remaining 1:05 RBU 100.0% UBU 97.1%
>>> 3895885824/4695924736 (83.0%) @12.0x, remaining 1:00 RBU 100.0% UBU 70.6%
>>> 3951427584/4695924736 (84.1%) @12.0x, remaining 0:56 RBU 100.0% UBU 97.1%
>>> 4006936576/4695924736 (85.3%) @12.0x, remaining 0:51 RBU 100.0% UBU 97.1%
>>> 4062478336/4695924736 (86.5%) @12.0x, remaining 0:47 RBU 100.0% UBU 97.1%
>>> 4118020096/4695924736 (87.7%) @12.0x, remaining 0:43 RBU 100.0% UBU 97.1%
>>> 4173529088/4695924736 (88.9%) @12.0x, remaining 0:39 RBU 100.0% UBU 97.1%
>>> 4229103616/4695924736 (90.1%) @12.0x, remaining 0:34 RBU 100.0% UBU 97.1%
>>> 4284579840/4695924736 (91.2%) @12.0x, remaining 0:30 RBU 100.0% UBU 97.1%
>>> 4340154368/4695924736 (92.4%) @12.0x, remaining 0:26 RBU 100.0% UBU 97.1%
>>> 4395663360/4695924736 (93.6%) @12.0x, remaining 0:22 RBU 100.0% UBU 97.1%
>>> 4451237888/4695924736 (94.8%) @12.0x, remaining 0:18 RBU 99.9% UBU 97.1%
>>> 4506779648/4695924736 (96.0%) @12.0x, remaining 0:13 RBU 99.9% UBU 97.1%
>>> 4562321408/4695924736 (97.2%) @12.0x, remaining 0:09 RBU 99.9% UBU 97.1%
>>> 4617830400/4695924736 (98.3%) @12.0x, remaining 0:05 RBU 100.0% UBU 97.1%
>>> 4673372160/4695924736 (99.5%) @12.0x, remaining 0:01 RBU 67.3% UBU 97.1%
>>> builtin_dd: 2292944*2KB out @ average 9.9x1352KBps
>>> /dev/pass0: flushing cache
>>> /dev/pass0: closing track
>>> /dev/pass0: closing disc
>>>
>>> i also noticed this output (console):
>>>
>>> (cd0:ata2:0:0:0): READ TOC/PMA/ATIP. CDB: 43 0 0 0 0 0 0 0 4 0
>>> (cd0:ata2:0:0:0): CAM status: SCSI Status Error
>>> (cd0:ata2:0:0:0): SCSI status: Check Condition
>>> (cd0:ata2:0:0:0): SCSI sense: ILLEGAL REQUEST csi:43,0,0,e asc:24,0
>>> (Invalid field in CDB): Command byte 6 is invalid
>>> (cd0:ata2:0:0:0): READ TOC/PMA/ATIP. CDB: 43 0 0 0 0 0 0 0 4 0
>>> (cd0:ata2:0:0:0): CAM status: SCSI Status Error
>>> (cd0:ata2:0:0:0): SCSI status: Check Condition
>>> (cd0:ata2:0:0:0): SCSI sense: ILLEGAL REQUEST csi:43,0,0,e asc:24,0
>>> (Invalid field in CDB): Command byte 6 is invalid
>>>
>>> my motherboard features a second SATA controller:
>>>
>>> ahci1: <Intel ICH9 AHCI SATA controller> port
>>> 0xe600-0xe607,0xe700-0xe703,0xe800-0xe807,0xe900-0xe903,0xea00-0xea1f
>>> mem 0xf8206000-0xf82067ff irq 19 at device 31.2 on pci0
>>
>> this one!
>>
>>>
>>> should i consider moving my hdd to this controller? i heard the
>>> jmicron controllers don't work very well under freebsd.
>>>
>>> i'm running
>>>
>>> FreeBSD otaku 9.0-CURRENT FreeBSD 9.0-CURRENT #4 r209884: Sat Jul 10
>>> 19:25:16 CEST 2010 root at otaku:/usr/obj/usr/src/sys/ARUNDEL amd64
>>>
>>> with
>>>
>>> options ATA_CAM
>>>
>>> in my kernel config.
>>>
>>> cheers.
>>>
>>> ps: during the `growisofs` session i made sure that no other
>>> application was causing heavy HDD activity!!!
>
> How much is your HDD really fast(when reading that iso file)?
dd if=/dev/ada0 of=/dev/null bs=1M count=4482
4482+0 records in
4482+0 records out
4699717632 bytes transferred in 66.619926 secs (70545224 bytes/sec)
>
> Usually when I use growisofs, files I burn are located on tmpfs or are
> completly cached in VM (yes, that is hardcore)
thanks for the hint. although i use tmpfs i only have 2GB of RAM.
that's why an entire DVD image (4.377 GiB) cannot reside inside tmpfs
(or any other memory backed fs) on my machine.
>
--
Alexander Best
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