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but when I tried enabling it I got a few errors. Warning: A few devices seemed to indicate they supported TRIM in firmware, like my Arcanite USB 3.1 Flash Drive. If the Maximum unmap LBA count is greater than 0, and Unmap command supported (LBPU) is 1, then the device firmware likely supports TRIM. Logical block provisioning VPD page (SBC): Take note of it, then run the following command and check the Unmap command supported (LBPU): # sg_vpd -p lbpv /dev/sda Run the following command and check the Maximum unmap LBA count: # sg_vpd -p bl /dev/sda #Raspberry pi as timer installTo check if the device firmware supports TRIM, switch to the root user (otherwise you'll need to use sudo before most of the rest of the commands in this post), and install a couple utilities we'll need for the rest of this process: $ sudo su Some of my drives actually support TRIM even if it's not enabled out of the box.įor example, testing with my Corsair Flash Voyager GTX flash drive, I was able to determine the firmware supports TRIM, and I was then able to manually enable TRIM following tom.ty89's instructions. Now, being enabled and being supported in firmware are two different things. If the DISC-MAX value is 0B, then TRIM is not enabled. If this reports back fstrim: /: the discard operation is not supported, then TRIM is not enabled. In Linux, you can check if TRIM is currently supported by running one of the following commands (this blog post assumes you're booting off the SSD, so it's device /dev/sda-if you are not booting from the SSD you're checking, substitute accordingly!): $ sudo fstrim -v / This blog post is not going to get into the weeds on TRIM I recommend this article on if you want to learn about it. What is TRIM? Why should I care about it? Much of the data in this post I attribute to this excellent comment by tom.ty89 on the Pi Forums. While internal microSD cards seem to support TRIM out of the box, none of the external USB drives I tested supported it out of the box. I'm working on a new video for my YouTube channel that will go into some more detail on which of the drives I tested support TRIM, but while I was researching for that video, I also found that TRIM support in Linux is not as simple as it seems at first glance-it's definitely not plug-and-play, in my experience. I explored UASP Support, which USB SSDs are the fastest, and I'm now booting my Pis from USB SSDs.Īnyways, one thing that I have wondered about-and some people have asked me about-is TRIM support. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.I've been doing a lot of benchmarking and testing with the Raspberry Pi 4 and SSDs connected via USB. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. #Raspberry pi as timer softwareThis program is free software you can redistribute it and/or modify it under the terms of the the Artistic License (2.0).ĭisclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. perldoc Device::BCM2835::Timer LICENSE AND COPYRIGHT You can find documentation for this module with the perldoc command. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. Please report any bugs or feature requests to bug-device-bcm2835-timer at rt., or through the web interface at. #Raspberry pi as timer 32 bitInternally, it is a pair of two 32 bit registers, which are read and added up correspondently in pure Perl. It ossillates at 1 MHz, thus every tick corresponds to 1 microsecond. #Raspberry pi as timer 64 BitThe function gives the value of the 64 bit timer counter installed on the BCM2835 chip. This function returns the number of microseconds elapsed since the Raspberry Pi in hand was turned on. Say Device::BCM2835::Timer::timer() FUNCTIONS timer() This module's timer() method returns the current value of the Raspberry Pi's internal timer. Device::BCM2835::Timer - Access to Raspberry Pi's timer VERSION ![]()
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