ET9000:Hänger in HD Aufnahmen
Re: ET9000:Hänger in HD Aufnahmen #21
Posted 6 January 2012 - 20:20
Vu+ Duo4K (without SE) (OpenPLi 9.0), Xtrend ET9000 (OpenPLi 9.0) with WD30EZRZ (3TB), VU+ Zero v1 (OpenPLi 9.0), Astra 13° + 19.2° + 28,2°, Denon AVR-X2800H, Samsung OLED TV GQ65S95CATXZG
Re: ET9000:Hänger in HD Aufnahmen #22
Posted 23 January 2012 - 11:31
betroffen sind (mit Ausnahme der glücklichen Benutzer):
-grosse Platten >1TB (bei mir eine 2TB und eine 1,5TB)
-ext4 formiert egal ob per Telnet oder per GUI
-Kernel = 3.x
-Anzahl der Hänger steigt mit dem Befüllungsgrad der Platte; bei mir fing es ab ca. 20% mit den ersten Hängern mitten in den Aufnahmen an)
-tritt auch bei Aufnahmen ohne weitere Nutzung/Last (also Timer in Abwesenheit) des Receivers auf
-Lt. TS_Doctor sind die Aufnahmen fehlerhaft; also kein Fehler bei der Wiedergabe
Getestet aber leider ohne Erfolg:
-Recording * auf diverse und auf hier empfohlene Werte => mehr/längere Hänger
-EXT4 Journaling ausgeschaltet => kaum spürbare Verbesserung
potentieller Workarround (laut diversen Berichten; ich selbst stelle in den nächsten Tagen um):
-interne Platte ext2 formatieren und demensprechen mit UUID mounten lassen
Fakten:
-ältere OpenPLI mit Kernel < 3.x: keine oder höchstens mal einen Hänger am Anfang einer Aufnahme
-keine Hänger bei Aufnahmen auf NAS über LAN
-es gibt viele Benutzer die sich so mit dem Receiver beschäftigen, nicht in Foren aktiv sind und die Hänger als Empfangsstörung deuten/hinnehmen
Re: ET9000:Hänger in HD Aufnahmen #23
Posted 23 January 2012 - 14:07
To do this, install tune2fs with opkg (you probably have it already) and then, assuming your harddisk is sda1:
umount /dev/sda1 tune2fs -o journal_data_writeback /dev/sda1 mount /dev/sda1 /media/hdd
If you type "mount" now, you should see "data=writeback" in the options for the harddisk mount.
Re: ET9000:Hänger in HD Aufnahmen #24
Posted 23 January 2012 - 22:32
some users with ext4 or ext3 with ext4 handling in kernel 3.x have problems with their movie records. There is a long thread inside the et-view-support forum.
Edited by anudanan, 23 January 2012 - 22:34.
Receiver:2 x Uno4k SE (PLI 7.3 rel), 1 x ET9200 (PLI 4.0), NAS: 2 x QNAP 410, TV: LG 65C8llla, LG 47LB570V, LG 42LM615S, Sound: Yamaha RX-v663, Teufel System 5 THX
Re: ET9000:Hänger in HD Aufnahmen #25
Re: ET9000:Hänger in HD Aufnahmen #26
Posted 25 January 2012 - 13:53
the vm values in there have been customized for a 2.6.18 kernel, on a device with limited memory.
The kernel defaults have changed over time, and I can imagine ext4 on a 3.1 kernel would be optimized for default vm values.
Re: ET9000:Hänger in HD Aufnahmen #27
Posted 25 January 2012 - 14:55
My /etc/sysctl.conf has the following values on the 2.6.18 kernel
vm.dirty_writeback_centisecs = 300
vm.dirty_background_ratio = 1
vm.dirty_ratio = 60
Receiver:2 x Uno4k SE (PLI 7.3 rel), 1 x ET9200 (PLI 4.0), NAS: 2 x QNAP 410, TV: LG 65C8llla, LG 47LB570V, LG 42LM615S, Sound: Yamaha RX-v663, Teufel System 5 THX
Re: ET9000:Hänger in HD Aufnahmen #28
Posted 25 January 2012 - 15:08
On boxes with 512 MB, those settings won't have much effect at all, it's very unlikely that your dirty_pages grows to 200MB in just 5 seconds.
Re: ET9000:Hänger in HD Aufnahmen #29
Posted 26 January 2012 - 12:05
This will be done today evening.
Re: ET9000:Hänger in HD Aufnahmen #30
Re: ET9000:Hänger in HD Aufnahmen #32
Posted 26 January 2012 - 12:59
In addition I have deleted the sysctl.conf as suggested by MiLo. - Thanks MiLo.
Re: ET9000:Hänger in HD Aufnahmen #33
Re: ET9000:Hänger in HD Aufnahmen #34
Re: ET9000:Hänger in HD Aufnahmen #35
Posted 26 January 2012 - 13:28
I'm testing ext4 "journaling off - writeback enabled" for quite a while and the freezer are at a absolut minimum. If at all, they only appaer while deleting huge files when recording is aktive.
Is that a "real" ext4 partition, or just an ext2/ext3 that happens to be mounted by the ext4 driver?
Deleting a 100GB file from the 160GB disk while recording did not cause any problems on my system, where i set the demux size to its minimum to maximize the chances of overrun. The "rm" command took almost a minute to complete.
So it's still a riddle why those bigger faster terabyte drives get such weird latencies on the ET, while an old laptop drive has no problem whatever I do to it.
Re: ET9000:Hänger in HD Aufnahmen #36
Posted 26 January 2012 - 13:29
Please test one thing at a time, so we know whether it was the journaling, or the sysctl.conf settings
But i have already done so.
1. Changed recording data* values => large values causes large freezers
2. Setted Journaling off by tune2fs -O ^has_journal => still freezers
3. deleted sysctl.conf => only a very small freeze at the beginning of a hd record
Re: ET9000:Hänger in HD Aufnahmen #37
Posted 26 January 2012 - 13:31
That wasn't my suggestion... I'm still assuming that the sysctl settings have no impact whatsoever.
You are right and sorry for the mistake. It sure was not your suggestion. Could be, that it has no impact, but I guess, it will not hurt either.
Edited by Hump, 26 January 2012 - 13:33.
Re: ET9000:Hänger in HD Aufnahmen #38
Posted 26 January 2012 - 13:39
Is that a "real" ext4 partition, or just an ext2/ext3 that happens to be mounted by the ext4 driver?
It's a real ext4 partition.
Deleting a 100GB file from the 160GB disk while recording did not cause any problems on my system, where i set the demux size to its minimum to maximize the chances of overrun. The "rm" command took almost a minute to complete.
So it's still a riddle why those bigger faster terabyte drives get such weird latencies on the ET, while an old laptop drive has no problem whatever I do to it.
Could it have something to do with the 4k Sector Drives? My drive is formated with starting sector 2048.
Re: ET9000:Hänger in HD Aufnahmen #39
Posted 26 January 2012 - 13:44
That wasn't my suggestion... I'm still assuming that the sysctl settings have no impact whatsoever.
You are right and sorry for the mistake. It sure was not your suggestion. Could be, that it has no impact, but I guess, it will not hurt either.
No, it won't hurt, but I think we'd like rule them out.
Could you please re-install your sysctl.conf file, by doing the following:
opkg install kernel-params -force-reinstall
And reboot. If you have no increase or decrease in recording 'performance', we can forget about the sysctl settings.
Re: ET9000:Hänger in HD Aufnahmen #40
Posted 26 January 2012 - 13:51
No, it won't hurt, but I think we'd like rule them out.
Could you please re-install your sysctl.conf file, by doing the following:
opkg install kernel-params -force-reinstall
And reboot. If you have no increase or decrease in recording 'performance', we can forget about the sysctl settings.
I tested several HD recordings after deletion of sysctl.conf and could not find any differences in performance. Still no freezers with ext4-journaling off and writeback enabled.
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