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Thanks for reading my topic. Simply who are the creator of CRC32 checksum ? Testing formating btrfs using crc32c and xxhash the performance is better for crc32c ... however xxhash is better for anti collision. Only trying understand the origin of that checksum type. Have an nice day.

Thanks for reading my topic. I only want select the sound backend path using better and less cpu processing. I see some replies in internet about if selecting in application the alsa sound goes that path Program > alsa wrapper > pulseaudio > alsa it's true ? Always selecting ALSA goes directly...

Hello. Thanks for reading my topic. Strangely in an BTRFS partition show the errors below when running sudo btrfs check --readonly --force --mode original --progress /dev/sdb1 Opening filesystem to check... Checking filesystem on /dev/sdb1 UUID: 7846f603-7ca7-4f38-9a02-b71583dba767 [1/7]...

Hello. Thanks for reading my topic. I have tested install ffmpeg 4.4.3 in focal 20.04, but need install dependencies below : librav1e0 libsvtav1enc1 librist4 libvmaf1 From lunar to current mantic are the files below librav1e0 libsvtav1enc1 librist4 Not any Ubuntu version have libvmaf1 I...

Hello. Thanks for reading my question. I need run an command before stopping target local-fs-pre.target. The command is used by an systemd service The command is for flush dmwritecache in disk partition before unmounting file system /usr/sbin/dmsetup message /dev/mapper/rc-wb_sda5 0 flush The...

Hello. I wait download image files jpg from an web site. The file ares box art of Atari 2600 games. Example http://www.atarimania.com/2600/boxes/hi_res/3d_havoc_cart_2.jpg Thus all images are in site structure http://www.atarimania.com/2600/boxes/hi_res/ Trying access...

I need to run a command (writeback dmsetup flush) when OS shutdown before stopping local file system pre (mounted disk partitions) thus being possible correctly flush writeback cache. In moment using the service below. [Unit] Description=Flush DefaultDependencies=no Before=umount.target...

Hello. Using rapiddisk being a wrapper to dm-writecache creating a writeback cache in RAM; The writeback cache is working. The problem is when OS shutdown files not are written in disk. Module dm-writecache is in kernel thus what command need to dm-writeback flush data from writeback cache in...

I want to load dm-writeback module and a command before initramfs load the OS mounting disk partitions (/home). Thanks for your reply.

I not understand if is a problem bug in nvidia driver or the OS. Using Ubuntu 21.04 with nvidia binary driver 465.27. The problem is in screen any area using white color use a high value (bright or gamma). Please see the links below with the screenshots...

Using Ubuntu 20.04 and 21.04. How disable or remove totally from OS the nvidia nouveau driver ? Thanks for reply.

Hello. Using Lubuntu 20.04.2 64 with kernel 5.8. Not is possible install Nvidia proprietary drivers version 460 because Nvidia DKMS 460 not is compatible with kernel 5.8 ? Anyone know an configuration to install latest driver version 460 ? I see perhaps the same issue happen with VirtualBox...

Lubuntu 20.04 64 bits. How enable write back for OS partitions (root and home) using an write cache buffer being one 128 MB for root and 64 Mb for home ? I want avoid useless repeated writes in same file being that OS and some softwares (browsers) does it. Thanks for reply.

Lubuntu 20.04 64 bits. External USB using BTRFS. How when inserting the USB drive auto mount using rw and compression-force zlib:9 ? If is possible the same configuration can be used to any other USb drive ? Thanks for reply.

Lubuntu 20.04 64 bits installed GCDEMU 3.2.4. Mounting an ISO look how being mounted and is displayed the files and directories, when using an software to read the mounted disc not file access. I not understand if the mounted ISO was exactly mounted being root is that is because of issue being...

Thanks for read. Disk partitioned being : 1 EXT2 - /boot 2 BTRFS - /root 3 BTRFS - /home 4 BTRFS Data Trying add parttion 4 in FSTAB and mount point to /home/data, /data or media/username/data the partition is mounted with full access read write only for root thus not being possible read or...

Using BTRFS in the last 3 months with good experience ... until today ... BTRFS is very good, but when happen a problem it is a big trouble. Using Lubuntu 20.04 64 bits being an partition for root and another for home both being BTRFS. Not swap partition. home partition BTRFS configured in fstab...

I use Lubuntu 20.04 64 bit. I had manually installed sixad_1.5.1+git20130130-0 and libusb-0.1-4_0.1.12 using deb packages because I could not get them using apt-get for Ubuntu 20.04. I has two PS3 controllers. After installing qtsiax the controller was connected and finally the LED was ON. I had...

Hello. Using the command below sudo btrfs filesystem defragment -v -r -czlib -f / defragment an BTRFS partition root using compression zlib. in fstab is possible select zlib compression 1 to 9. strange detail is that defrag command allow to select zlib, but not has any information if is...

Hello. Thanks for read my post. I wish use BTRFS using compression and avoiding if possible useless writes on disk. Thus I had added the settings below in fstab. noautodefrag,compress-force=zlib:9,nospace_cache,noatime,commit=36000,max_inline=0 The settings above create problems ? If yes which...