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| author | adsharma@los-vmm.sc.intel.com <adsharma@los-vmm.sc.intel.com> | 2005-08-15 12:50:38 -0800 |
|---|---|---|
| committer | adsharma@los-vmm.sc.intel.com <adsharma@los-vmm.sc.intel.com> | 2005-08-15 12:50:38 -0800 |
| commit | f04c4b32acf1d249113cc9e38606089000e22a55 (patch) | |
| tree | 83b183d099973b382c17370945c34bfdc65b40f5 | |
| parent | c004ce577213e5ba00d8d6ec9573bb9200207dcc (diff) | |
| download | xen-f04c4b32acf1d249113cc9e38606089000e22a55.tar.gz xen-f04c4b32acf1d249113cc9e38606089000e22a55.tar.bz2 xen-f04c4b32acf1d249113cc9e38606089000e22a55.zip | |
Enable multi-word DMA mode 2 for the PIIX3 chipset
Without this patch, Linux PIIX3 driver would see ultra DMA and get confused
and ended up disabling DMA.
With the patch, we're able to see 3x increase in disk read throughput.
Signed-off-by: Winston Wang <winston.l.wang@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>
| -rw-r--r-- | tools/ioemu/hw/ide.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/ioemu/hw/ide.c b/tools/ioemu/hw/ide.c index 5e5610e136..c0228cbd9e 100644 --- a/tools/ioemu/hw/ide.c +++ b/tools/ioemu/hw/ide.c @@ -430,6 +430,7 @@ static void ide_identify(IDEState *s) put_le16(p + 59, 0x100 | s->mult_sectors); put_le16(p + 60, s->nb_sectors); put_le16(p + 61, s->nb_sectors >> 16); + put_le16(p + 63, 0x07); put_le16(p + 80, (1 << 1) | (1 << 2)); put_le16(p + 82, (1 << 14)); put_le16(p + 83, (1 << 14)); @@ -460,7 +461,7 @@ static void ide_atapi_identify(IDEState *s) put_le16(p + 48, 1); /* dword I/O (XXX: should not be set on CDROM) */ put_le16(p + 49, 1 << 9); /* LBA supported, no DMA */ put_le16(p + 53, 3); /* words 64-70, 54-58 valid */ - put_le16(p + 63, 0x103); /* DMA modes XXX: may be incorrect */ + put_le16(p + 63, 0x07); /* Multi-word DMA mode 2 */ put_le16(p + 64, 1); /* PIO modes */ put_le16(p + 65, 0xb4); /* minimum DMA multiword tx cycle time */ put_le16(p + 66, 0xb4); /* recommended DMA multiword tx cycle time */ |