Questions tagged [performance]
The speed at which a program runs
1,061 questions
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What is the cost of listening on ports?
If you would open a listening socket on every possible TCP/UDP port (so thousands in total), without actually using them, what would be the cost in terms of performance?
Is it merely an administrative ...
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why is rsync slow compared to cp
I asked the question yesterday of why is NFSv4 so much slower than scp.
I narrowed down things a bit, my real question now is why is rsync slow compared to cp ? as I don't think NFS is a factor. I've ...
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why is NFSv4 so much slower than scp
why is NFSv4 so much slower than scp?
mellanox 100gbps switch
no load on two servers, just me, no load on the switch
RHEL-8.10 x64-64
scp *tar 192.168.2.1:/data/
a.tar ...
- 8,966
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How can I see how much space was freed by trim on an SSD?
In my current setup, I have three different filesystems on two different SSDs: A FAT partition and a BTRFS partition on one drive, and ext4 on a second drive. When running fstrim, the output is ...
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Is it worth the hassle and risk of reformatting an NVME to use 4K blocks on a ZFS pool created with ashift=12?
I recently upgraded the NVME drives on my workstation machine, from a pair of Samsung EVO 970 512GB drives to a pair of of Kingston Fury 2TB drives. All went well, and I even converted the machine ...
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XRDP poor performance for streaming videos
I don't know what to do I spend around 2 weeks setting up XRDP. I have XRDP up and running with Xorg on a 64 core epyc 3 gen. and performance is terrible. The machine's main usage should be as a ...
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XRDP RDP vs Remmina issues
Hello I use XRDP for multiuser and I have performance issue and connec issue.
First, is about channel drdynvc if its set to TRUE I cannot connect from windows RDP client and can connect without issues ...
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Installing Kali Linux on a external HDD, dual-booting with Windows 10
I have Oracle VM on my Windows 10 laptop and installed Kali Linux on it.
But after using the VM several times, Kali Linux crashes and does not launch.
So, I decided to install Kali Linux on an ...
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ldd /usr/bin/pg_restore gives error not a dynamic executable
I am trying to determine the libraries needed for pg_restore in the official postgres:15 docker image, but when I run ldd /usr/bin/pg_restore inside the container it returns this error: not a dynamic ...
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dm-crypt IOPS amplification
I have a ZFS pool comprising a mirror comprising two partitions encypted with dm-crypt.
$ zpool list -v data2
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP ...
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dd with 1M buffer is running at only 1 MB/s - disk usually can be accessed at full speed
I am running the command dd bs=1M if=/dev/zero of=/dev/md7 status=progress. It started very slow at 4 MB/s but now has dropped to 1 MB/s. This is a standard SATA disk that was running perfectly ...
- 101
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Why is my ZFS read performance tanking for RND4K reads and writes compared to an XFS partition on the same drive?
I have a pair of NVMe Crucial P5 Plus partitioned with an mdadm RAID1 partition formatted as XFS for / and another ZFS RAIDZ1 partition for the remainder of the disk.
Performance of the XFS partition ...
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how to configure or tune infiniband redhat 8
I asked a similar question here : NFS v4.2 tuning
with less than 50 servers on a closed infiniband [mellanox] HDR network switch all running RHEL-8.10:
is there anything other than systemctl start ...
- 8,966
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Recovery of a compressed image not possible due to lack of Space - general understanding of compression methods
I used gzip to compress an image which is quite huge still.
dd if=/dev/sda2 bs=1M | gzip -c -9 > sda2.dd.img.gz
then I changed the partitioning of the Drive because I wanted to install Linux.
And ...
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Disable read-ahead caching for GFS2 Logical Volume
I have 10 node deployment which implement red hat clustering software - pacemaker/corosync to mount gfs2 and ensure high-availability. Nodes are actually mail servers and use gfs2 to store user's data ...
