Intel Software Network - feed

Interesting observation

Fri, 13 Nov 2009 01:35:02 -0800

In an attempt to discern the maximum throughput of my [100Mbps] local network, and to a lesser extent see what level of overhead is introduced by the operating system (Windows), I performed a crude test which simply involved pushing as much traffic onto the link as possible destined to the next hop (router)

Surprisingly, network utilization peaked at around 4MB/s (~33%); clearly very far from optimal.

Long story short, the problem turned out to be the interrupt rate of the network adapter which was [during the initial test] set at 'adaptive', after modifying this to the lowest possible setting network utilization was able to maintain a stable ~99%. Oddly enough, Intel's recommendation was for higher interrupt rates when in high-load situations ... this actually produced a negative effect rendering < 12% utilization.

how to change CPU supply voltage for Intel Xeon CPU L5420 ?

Wed, 11 Nov 2009 20:00:08 -0800

For Intel Xeon CPU L5420,

Via which command or system call can I change the voltage?

thank you

Acessing the SMRAM of Intel Xeon 5500

Mon, 26 Oct 2009 17:03:44 -0700

I need to rewrite the SMRAM of an Intel Xeon 5500 server. I got the D_LCK bit in the SAD_SMRAM register cleared by firmware development people. I set the S_OPEN to 1 (overall register value is 0x4A). However, I still cannot access the SMRAM and all I see is high values 0xff in the adress that hosts the memeory (I got that from the firmware developers. Is there any extra step I am missing to access the SMRAM??

Performance of 16-bit code in modern x86 processors

Thu, 22 Oct 2009 19:34:50 -0700

Do anyone know the performance of 16-bit code in modern x86 processors? I remember the Pentium Pro from back in 1995 which was the processor that basically revealed the 16-bit code in the "32-bit" Windows 95. In fact, not as well known, but Transmeta ended up being hit by this again in 1998, which delayed it's processor for a year.

DVFS - modifying the processor voltage

Thu, 22 Oct 2009 13:16:07 -0700

Hello,
I am using cpuspeed daemon (userspace module ) to modify the processor frequency of my processors. Does this automatically
scale down or scale up the voltage too? Or is there a separate command to modify the voltage of a processor?
If so, what is it?

I have Xeon 5520 Nahelem processor. and OS is CentOS 5.3.

Regards,
Priya

Sorry, this does not really belong here, but I did not know how to ask elsewhere

Thu, 15 Oct 2009 16:39:26 -0700

Ignore the "Forum Name", I had to pick something! For some reason I cannot start a discussion in the support forum. Any ideas Why? i can enter a headline, and code and tag, but no message body.

Knut

Processor Identification (Pre-CPUID)

Thu, 08 Oct 2009 19:28:39 -0700

I am not sure if this is the right place to ask these questions. Please direct me to a different forum if there is one better suited.

First off, according to Volume 1 of the Intel 64 and IA-32 Architectures Software Developer's Manual, bits 12 through 15 of the FLAGS register are always set if the processor is a 8086/8088. For the 80286 in real-address mode, they are always cleared. What about the 80186? Like the 8086/8088? Like the 286? Somewhere in between?

I have searched the internet, but have failed to find the reference manuals for any of these older processors.

Also, I have seen an algorithm for testing the FLAGS register to determine the identity of the pre-CPUID processors. There seems to be a lot of excessive moving and modifying of values. If the 8086 and 8088 always sets those four bits and the 80286 always has them cleared, what is the point of the algorithm toggling them off and on? If they are all set to begin with, is that not enough of an indicator that it is 8086/8088 and not a 286?

I apologize if such is a stupid question. I am new to this. It just seems that all the popping, pushing, modifying, and moving is a little excessive for detecting the 8086/8088. Or am I wrong?

Invoke ACPI methods

Fri, 25 Sep 2009 16:43:54 -0700

Hello,

I'm currently trying to understand at least a minimum how ACPI works. After unsuccessful googling about how to invoke ACPI methods, i'm begging some help here.

So, here are my wonderings :
1. Are the ACPI registers (i.e PM1a_CNT) all accessible via PIO ? If there are some in MMIO? In that case, how can i know if they can be accessed via MMIO or PIO ?
2. How can i call an ACPI method (like \_OSI for example) ? Has anyone a C sample program with the invocation of an ACPI method ?
3. Do you have any references (easy to understand) that i can read to implement a driver that uses ACPI ?

Thanks a lot.

Fernand

creating driver MSI's

Fri, 11 Sep 2009 16:03:51 -0700

has anyone ever succesfully packaged the LAN_all_net_Intel_170798 and the management engine for the 9669 chipset from exe to msi using Admin Studio or any other package installer. we have tried to do this however both of the packages fail when loading in MSI format

question

Mon, 07 Sep 2009 14:25:41 -0700

What is the major differences between a intel core 2 solo cpu processor and a normal pentium core duel processor