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Make the SSLOTS, MSLOTS and JSLOTS tunable (redefineable).

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Bump the default values for these to the values used by FreeBSD,
and also adjust ti_init_rx_ring_jumbo() to use the same constant
that FreeBSD uses.  Yes, this consumes more kernel memory.

The effect of this is that you can use jumbo frames in a back-to-back
setup with TCP windows up to about 250KB and get ~930Mbit/s throughput,
while we were earlier limited to around 3-400Mbit/s, and trying to push
above that mark by widening the TCP window caused
  ti0: jumbo buffer allocation failed
messages to be logged and a corresponding stall in the traffic.
This commit is contained in:
he 2004-07-27 07:59:51 +00:00
parent 047e7ad434
commit 00e7d35ef0
2 changed files with 13 additions and 7 deletions
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6
sys/dev/pci/if_ti.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_ti.c,v 1.60 2004/03/18 23:20:32 bouyer Exp $ */
/* $NetBSD: if_ti.c,v 1.61 2004/07/27 07:59:51 he Exp $ */
/*
* Copyright (c) 1997, 1998, 1999
@ -81,7 +81,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ti.c,v 1.60 2004/03/18 23:20:32 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_ti.c,v 1.61 2004/07/27 07:59:51 he Exp $");
#include "bpfilter.h"
#include "opt_inet.h"
@ -983,7 +983,7 @@ static int ti_init_rx_ring_jumbo(sc)
int i;
struct ti_cmd_desc cmd;
for (i = 0; i < (TI_JSLOTS - 20); i++) {
for (i = 0; i < TI_JUMBO_RX_RING_CNT; i++) {
if (ti_newbuf_jumbo(sc, i, NULL) == ENOBUFS)
return(ENOBUFS);
};

14
sys/dev/pci/if_tireg.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_tireg.h,v 1.13 2004/03/18 23:20:32 bouyer Exp $ */
/* $NetBSD: if_tireg.h,v 1.14 2004/07/27 07:59:51 he Exp $ */
/*
* Copyright (c) 1997, 1998, 1999
@ -996,9 +996,15 @@ struct ti_event_desc {
* allocated for the standard, mini and jumbo receive rings.
*/
#define TI_SSLOTS 64 /* 256 */
#define TI_MSLOTS 64 /* 256 */
#define TI_JSLOTS 64 /* 256 */
#ifndef TI_SSLOTS
#define TI_SSLOTS 256
#endif
#ifndef TI_MSLOTS
#define TI_MSLOTS 256
#endif
#ifndef TI_JSLOTS
#define TI_JSLOTS 384
#endif
#define TI_RSLOTS 128
#define TI_JRAWLEN (ETHER_MAX_LEN_JUMBO + ETHER_ALIGN + sizeof(u_int64_t))