On 3/10/22 02:47, Patrick O'Callaghan wrote:
On Wed, 2022-03-09 at 11:25 -0800, Samuel Sieb wrote:
On 3/9/22 02:44, Patrick O'Callaghan wrote:
Thanks for the detailed info. My current SSD is a Samsung 860 EVO
(2TB)
so for comparison I did this:
$ time dd if=/dev/zero bs=1G count=23 of=Big
23+0 records in
23+0 records out
24696061952 bytes (25 GB, 23 GiB) copied, 14.9873 s, 1.6 GB/s
real 0m15.087s
user 0m0.000s
sys 0m14.640s
However that's clearly not a reflection of actual I/O speed as the
writes will have been cached.
You can use "conv=fdatasync" to make sure all data is written before
giving the final result.
Didn't seem to make a difference:
$ time dd if=/dev/zero bs=1G count=23 conv=fdatasync of=Big
23+0 records in
23+0 records out
24696061952 bytes (25 GB, 23 GiB) copied, 15.3153 s, 1.6 GB/s
Are you using btrfs with compression enabled?
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