[PATCH] Additions to full lowlatency patch

Jussi Laako (jussi.laako@kolumbus.fi)
Sat, 12 Jan 2002 23:48:19 +0200


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Hi,

I've done some changes to lowlatency patched kernel. Mainly "fixes" to DRM
drivers and few network drivers. Most probably I have done something really
stupid, but those work here(tm). Especially the Radeon driver patch has got
a lot of testing and seems to have huge impact to latencies in my system.

Best regards,

- Jussi Laako

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diff -ur linux-2.4.17-lowlatency/drivers/char/drm/mga_dma.c linux-2.4.17-lowlatency-jl/drivers/char/drm/mga_dma.c --- linux-2.4.17-lowlatency/drivers/char/drm/mga_dma.c Wed Aug 8 19:42:15 2001 +++ linux-2.4.17-lowlatency-jl/drivers/char/drm/mga_dma.c Mon Dec 31 22:05:06 2001 @@ -61,6 +61,7 @@ MGA_WRITE8( MGA_CRTC_INDEX, 0 ); return 0; } + conditional_schedule(); udelay( 1 ); } @@ -80,6 +81,7 @@ for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) { status = MGA_READ( MGA_STATUS ) & MGA_DMA_IDLE_MASK; if ( status == MGA_ENDPRDMASTS ) return 0; + conditional_schedule(); udelay( 1 ); } @@ -121,6 +123,7 @@ * How about we clean up after ourselves? */ MGA_WRITE( MGA_RST, MGA_SOFTRESET ); + conditional_schedule(); /* We shouldn't get here anyway... */ udelay( 15 ); /* Wait at least 10 usecs */ MGA_WRITE( MGA_RST, 0 ); diff -ur linux-2.4.17-lowlatency/drivers/char/drm/r128_cce.c linux-2.4.17-lowlatency-jl/drivers/char/drm/r128_cce.c --- linux-2.4.17-lowlatency/drivers/char/drm/r128_cce.c Mon Aug 27 17:40:33 2001 +++ linux-2.4.17-lowlatency-jl/drivers/char/drm/r128_cce.c Mon Dec 31 22:08:38 2001 @@ -128,6 +128,7 @@ if ( !(R128_READ( R128_PC_NGUI_CTLSTAT ) & R128_PC_BUSY) ) { return 0; } + conditional_schedule(); udelay( 1 ); } @@ -144,6 +145,7 @@ for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) { int slots = R128_READ( R128_GUI_STAT ) & R128_GUI_FIFOCNT_MASK; if ( slots >= entries ) return 0; + conditional_schedule(); udelay( 1 ); } @@ -165,6 +167,7 @@ r128_do_pixcache_flush( dev_priv ); return 0; } + conditional_schedule(); udelay( 1 ); } @@ -225,6 +228,7 @@ return r128_do_pixcache_flush( dev_priv ); } } + conditional_schedule(); udelay( 1 ); } @@ -928,6 +932,7 @@ return buf; } } + conditional_schedule(); udelay( 1 ); } @@ -961,6 +966,7 @@ r128_update_ring_snapshot( ring ); if ( ring->space >= n ) return 0; + conditional_schedule(); udelay( 1 ); } diff -ur linux-2.4.17-lowlatency/drivers/char/drm/radeon_cp.c linux-2.4.17-lowlatency-jl/drivers/char/drm/radeon_cp.c --- linux-2.4.17-lowlatency/drivers/char/drm/radeon_cp.c Sat Sep 15 00:29:41 2001 +++ linux-2.4.17-lowlatency-jl/drivers/char/drm/radeon_cp.c Mon Dec 31 21:59:45 2001 @@ -356,6 +356,7 @@ & RADEON_RB2D_DC_BUSY) ) { return 0; } + conditional_schedule(); udelay( 1 ); } @@ -375,6 +376,7 @@ int slots = ( RADEON_READ( RADEON_RBBM_STATUS ) & RADEON_RBBM_FIFOCNT_MASK ); if ( slots >= entries ) return 0; + conditional_schedule(); udelay( 1 ); } @@ -398,6 +400,7 @@ radeon_do_pixcache_flush( dev_priv ); return 0; } + conditional_schedule(); udelay( 1 ); } @@ -1316,6 +1319,7 @@ start = 0; #endif } + conditional_schedule(); udelay( 1 ); } @@ -1355,6 +1359,7 @@ radeon_update_ring_snapshot( ring ); if ( ring->space > n ) return 0; + conditional_schedule(); udelay( 1 ); } diff -ur linux-2.4.17-lowlatency/drivers/net/3c59x.c linux-2.4.17-lowlatency-jl/drivers/net/3c59x.c --- linux-2.4.17-lowlatency/drivers/net/3c59x.c Fri Dec 21 19:41:54 2001 +++ linux-2.4.17-lowlatency-jl/drivers/net/3c59x.c Mon Dec 31 22:31:10 2001 @@ -1368,6 +1368,7 @@ dev->name, cmd, i * 10); return; } + conditional_schedule(); udelay(10); } printk(KERN_ERR "%s: command 0x%04x did not complete! Status=0x%x\n", diff -ur linux-2.4.17-lowlatency/drivers/net/8139too.c linux-2.4.17-lowlatency-jl/drivers/net/8139too.c --- linux-2.4.17-lowlatency/drivers/net/8139too.c Fri Dec 21 19:41:54 2001 +++ linux-2.4.17-lowlatency-jl/drivers/net/8139too.c Mon Dec 31 22:33:00 2001 @@ -707,6 +707,7 @@ barrier(); if ((RTL_R8 (ChipCmd) & CmdReset) == 0) break; + conditional_schedule(); udelay (10); } } @@ -1774,6 +1775,7 @@ RTL_W8_F (ChipCmd, CmdTxEnb); tmp_work = 200; while (--tmp_work > 0) { + conditional_schedule(); udelay(1); tmp8 = RTL_R8 (ChipCmd); if (!(tmp8 & CmdRxEnb)) @@ -1785,6 +1787,7 @@ tmp_work = 200; while (--tmp_work > 0) { RTL_W8_F (ChipCmd, CmdRxEnb | CmdTxEnb); + conditional_schedule(); udelay(1); tmp8 = RTL_R8 (ChipCmd); if ((tmp8 & CmdRxEnb) && (tmp8 & CmdTxEnb)) diff -ur linux-2.4.17-lowlatency/drivers/net/eepro100.c linux-2.4.17-lowlatency-jl/drivers/net/eepro100.c --- linux-2.4.17-lowlatency/drivers/net/eepro100.c Fri Dec 21 19:41:54 2001 +++ linux-2.4.17-lowlatency-jl/drivers/net/eepro100.c Mon Dec 31 22:41:42 2001 @@ -324,7 +324,11 @@ static inline void wait_for_cmd_done(long cmd_ioaddr) { int wait = 1000; - do udelay(1) ; + do + { + conditional_schedule(); + udelay(1) ; + } while(inb(cmd_ioaddr) && --wait >= 0); #ifndef final_version if (wait < 0)

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