Re: parallel cgd

[Tobias Nygren <tnn%NetBSD.org@localhost>]

On Mon, 9 Mar 2020 08:42:17 -0000 (UTC)
Michael van Elst <mlelstv%serpens.de@localhost> wrote:

> This should improve performance on multi-core systems.

Nominated for understatement of the year.

# dd if=/dev/rcgd0d bs=1m count=4096 of=/dev/null
Before:
4294967296 bytes transferred in 58.928 secs (72885000 bytes/sec)
After:
4294967296 bytes transferred in 9.712 secs (442233041 bytes/sec)

On "Intel(R) Xeon(R) CPU E5-2660 v2 @ 2.20GHz" w/ NVMe disk.

> Feedback welcome.

It's a huge win. Thanks!
Candidate for netbsd-9?

Kind regards,
-Tobias