Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine [solved]

2007-06-22 Thread Peter Rabbitson
Robert Hancock wrote: Peter Rabbitson wrote: reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x8000 (2048MB), size=1024MB: write-back, count=1 reg02: base=0xc000 (3072MB), size= 512MB: write-back, count=1 reg03: base=0xe000 (3584MB), size= 256MB: write-

Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine

2007-06-22 Thread Robert Hancock
Peter Rabbitson wrote: Robert Hancock wrote: Peter Rabbitson wrote: H. Peter Anvin wrote: What does /proc/mtrr look like in the two cases? Identical for mem=3900 and without it. reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x8000 (2048MB), size=1024MB:

Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine

2007-06-22 Thread Peter Rabbitson
Robert Hancock wrote: Peter Rabbitson wrote: H. Peter Anvin wrote: What does /proc/mtrr look like in the two cases? Identical for mem=3900 and without it. reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x8000 (2048MB), size=1024MB: write-back, count=1 reg

Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine

2007-06-21 Thread Robert Hancock
Peter Rabbitson wrote: H. Peter Anvin wrote: Peter Rabbitson wrote: I have captured dmesg output without mem[5], with mem=3900M[6] and mem=2048M[7]. What does /proc/mtrr look like in the two cases? Identical for mem=3900 and without it. reg00: base=0x ( 0MB), size=2048MB: write

Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine

2007-06-21 Thread Peter Rabbitson
H. Peter Anvin wrote: Peter Rabbitson wrote: I have captured dmesg output without mem[5], with mem=3900M[6] and mem=2048M[7]. What does /proc/mtrr look like in the two cases? Identical for mem=3900 and without it. reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01:

Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine

2007-06-21 Thread H. Peter Anvin
Peter Rabbitson wrote: > > I have captured dmesg output without mem[5], with mem=3900M[6] and > mem=2048M[7]. > What does /proc/mtrr look like in the two cases? -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] M