From: Sape Mullender <sape@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: [9fans] kernel/graphics slowness
Date: Wed, 1 May 2002 12:58:51 -0400 [thread overview]
Message-ID: <d8dd28679dc7183cf603a4969884ffca@plan9.bell-labs.com> (raw)
Some of you reported slow to extremely slow graphics operations.
We found the cause; it's a bug in the usb driver. You can apply this
fix to usbuhci.c:
diff /n/dump/2002/0501/sys/src/9/pc/usbuhci.c usbuhci.c
1483,1484c1483
< ctlr->ctlq->head = PCIWADDR(ctlr->bwsop) | IsQH;
< ctlr->bwsop->head = PCIWADDR(ctlr->bulkq) | IsQH;
---
> ctlr->ctlq->head = PCIWADDR(ctlr->bulkq) | IsQH;
1486c1485,1489
< ctlr->recvq->head = PCIWADDR(ctlr->bwsop) | IsQH; /* loop back */
---
> ctlr->recvq->head = PCIWADDR(ctlr->bwsop) | IsQH;
> if (1) /* set up loop back */
> ctlr->bwsop->head = Terminate;
> else
> ctlr->bwsop->head = PCIWADDR(ctlr->bwsop) | IsQH;
reply other threads:[~2002-05-01 16:58 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=d8dd28679dc7183cf603a4969884ffca@plan9.bell-labs.com \
--to=sape@plan9.bell-labs.com \
--cc=9fans@cse.psu.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).