Gary Thorpe wrote:
[No subject in first one, sorry for repost]
...
1.6 Gb/s = system bus bandwidth. Cache won't affect this bandwidth. DDR400 has
400 MB/s: only attainable for long sequential accesses of either read or write
but not a mix of both. DMA should be able to get near this limit (lon
[No subject in first one, sorry for repost]
Jin Guojun [VFFS] wrote:
> You are fast away from the real world. This has been explained million
> times, just like
> I teach intern student every summer :-)
>
> First of all, DDR400 and 200 MHz bus mean nothing -- A DDR 266 + 500MHz
> CPU system
> ca
Jin Guojun [VFFS] wrote:
> You are fast away from the real world. This has been explained million
> times, just like
> I teach intern student every summer :-)
>
> First of all, DDR400 and 200 MHz bus mean nothing -- A DDR 266 + 500MHz
> CPU system
> can over perform a DDR 400 + 1.7 GHz CPU syst
Chris Howells wrote:
On Wednesday 22 March 2006 18:52, Arne Woerner wrote:
It is an ECS K7VMM or K7VMM+ if I recall it correctly... Bought in
2003...
Is it easy to explain, why the 266FSB cannot do 8Gbit/sec without
problem? I mean: 2*133MHz*32bit=8.3125Gbit/sec... Is the MMU too
slow (e.
On Wednesday 22 March 2006 18:52, Arne Woerner wrote:
> It is an ECS K7VMM or K7VMM+ if I recall it correctly... Bought in
> 2003...
>
> Is it easy to explain, why the 266FSB cannot do 8Gbit/sec without
> problem? I mean: 2*133MHz*32bit=8.3125Gbit/sec... Is the MMU too
> slow (e. g. due to "cheap"
Arne Woerner wrote:
Notice that your memory copy speed will be one half of it.
Why "half"? dd causes two copies but counts each byte just once...
Maybe "dd" in combination with /dev/zero is not the right way to
measure memory bandwidth?
It depends on how /dev/null implemented. It m
Arne Woerner wrote:
It depends on how you use /dev/zero.
dd of=/dev/null if=/dev/zero bs=4k count=100k
tests cache speed
% dd of=/dev/null if=/dev/zero bs=4k count=100k
102400+0 records in
102400+0 records out
419430400 bytes transferred in 0.204511 secs (2050894814
bytes/sec)
ab
Arne Woerner wrote:
--- "Jin Guojun [VFFS]" [1]<[EMAIL PROTECTED]> wrote:
In you example:
Now your 1.6 GB/s reduced to 16MB/s or even worse just based
on this factor.
What did we show by this <> test? I thought
that would prove the memory bandwidth is about 8Gbit/sec
(1GByte/sec; 2 * /2^3
--- "Jin Guojun [VFFS]" <[EMAIL PROTECTED]> wrote:
> Even after your program finished, you had only 277 MB/s (DDR
memory?),
> which is far below a good motherboard. Good motherboards should
> have 500 - 900 MB/s memory bandwidth, while expensive
motherboards
> can have 1-3 GB/s memory bandwidth, wh
--- "Jin Guojun [VFFS]" <[EMAIL PROTECTED]> wrote:
>Arne Woerner wrote:
>> What did we show by this <> test? I
thoughtthat
>> would prove the memory bandwidth is about 8Gbit/sec(1GByte/sec;
>> 2 * >number>/2^30).
>>
> It depends on how you use /dev/zero.
> dd of=/dev/null if=/dev/zero bs=4k cou
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