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0 votes

Set ALL cpu cores to PERFORMANCE permanently

I would use tuned which is a systemd service. It would solve an issues regarding not persisting after reboots. Below are the profiles that are shown from tuned-2.22.1-4.el8_10.1.noarch installed in ...
ron's user avatar
  • 7,239
1 vote

Horrible performance when downloading from CIFS mounted drive

Since this happens on multiple protocols, it's likely that there's network configuration to blame here. (aside from you, say, setting hard cgroupv2 I/O limits that you forgot about ;) That'd be a ...
Marcus Müller's user avatar
0 votes

Is increasing the max_pool_percent parameter for zswap a smart idea to combine concepts of zram and zswap to increase memory and decrease disk usage?

Yes you are correct. Two factors why zram is used at all: It's commonly used on phones, where they don't have swap at all. First, because swapping would wear out the flash; second, because a lot of ...
hwertz's user avatar
  • 165
1 vote

Simulate slow disks in KVM to see effect of LVM cache in test setup

I decided to try out Austin Hemmelgarn's method, and I can say definitively that it works... almost too well. I wanted to run a quick test with the Fedora 40 Workstation VM I already have installed, ...
FeRD's user avatar
  • 940
6 votes

Simulate slow disks in KVM to see effect of LVM cache in test setup

QEMU provides internal support for limiting bandwidth in bytes per second and IO rates based on IO operations per second (in both cases with support for doing this differently for read or write ...
Austin Hemmelgarn's user avatar
5 votes

Simulate slow disks in KVM to see effect of LVM cache in test setup

The device-mapper subsystem includes CONFIG_DM_DELAY, a device-mapper target that can be used to add delay to disk operations. The Debian 12 standard kernel includes it as a module. For example: ...
telcoM's user avatar
  • 101k
8 votes

Simulate slow disks in KVM to see effect of LVM cache in test setup

Qemu has native support for Network Block Devices (NBD), --drive file=nbd://<host>[:<port>]/[<export>]. (you could also use nbd.ko in the guest itself). That's kind of useful, ...
Marcus Müller's user avatar

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