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re: kern/19803 (usbd_alloc_buffer fails often)
The following reply was made to PR kern/19803; it has been noted by GNATS.
From: matthew green <mrg%eterna.com.au@localhost>
Cc: kern-bug-people%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
gnats-admin%netbsd.org@localhost, maya%NetBSD.org@localhost, toshii%netbsd.org@localhost
Subject: re: kern/19803 (usbd_alloc_buffer fails often)
Date: Tue, 06 Aug 2019 11:10:00 +1000
> State-Changed-From-To: open->closed
> State-Changed-By: maya%NetBSD.org@localhost
> State-Changed-When: Mon, 05 Aug 2019 22:13:36 +0000
> This PR documents an issue but:
> - Is stale, so likely to be ignored,
> - Doesn't contain the right information.
> This is likely a memory fragmentation issue. I am under the impression U=
SB still uses
> more contiguous memory than it absolutely has to, so perhaps we could us=
e a reminder,
> but this PR isn't a good reminder because it doesn't talk about it.
> Memory fragmentation issues have come and gone in netbsd since the filin=
g of this PR,
> so perhaps things are better or worse now. It's unclear.
AFAICT, this problem is still 100% the same.
now that your update talks about fragmentation, i think the
PR has all the details it needs -- it certainly happens on
a 64GB machine with a lot of free ram that was active in
recent times. enough concurrent 4095mb dd's ends up making
it work again.
unless the problem is documented in another PR, i think this
one should be re-opened.
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