* [9fans] kernel/graphics slowness
@ 2002-05-01 16:58 Sape Mullender
0 siblings, 0 replies; only message in thread
From: Sape Mullender @ 2002-05-01 16:58 UTC (permalink / raw)
To: 9fans
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;
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2002-05-01 16:58 [9fans] kernel/graphics slowness Sape Mullender
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