jm + intel   4

A Tour Inside CloudFlare's Latest Generation Servers
great transparency from CloudFront! Looking at their current 4th-gen rackmount server buildout -- now with HP after Dell and ZT. Shitloads of SSDs for lower power and greater predictability in failure rates. 128GB RAM. consistent hashing to address stores instead of RAID. Sandybridge chipset. Solarflare SFC9020 10Gbps network cards. This is really impressive openness for a high-scale custom datacenter server platform...
datacenter  cloudflare  hardware  rackmount  ssds  intel 
july 2013 by jm
IPMI: Freight Train To Hell
'Intel's Intelligent Platform Management Interface (IPMI), which is implemented and added onto by all server vendors, grant system administrators with a means to manage their hardware in an Out of Band (OOB) or Lights Out Management (LOM) fashion. However there are a series of design, utilization, and vendor issues that cause complex, pervasive, and serious security infrastructure problems.

The BMC is an embedded computer on the motherboard that implements IPMI; it enjoys an asymmetrical relationship with its host, with the BMC able to gain full control of memory and I/O, while the server is both blind and impotent against the BMC. Compromised servers have full access to the private IPMI network

The BMC uses reusable passwords that are infrequently changed, widely shared among servers, and stored in clear text in its storage. The passwords may be disclosed with an attack on the server, over the network network against the BMC, or with a physical attack against the motherboard (including after the server has been decommissioned.)

IT's reliance on IPMI to reduce costs, the near-complete lack of research, 3rd party products, or vendor documentation on IPMI and the BMC security, and the permanent nature of the BMC on the motherboard make it currently very difficult to defend, fix or remediate against these issues.'

(via Tony Finch)
via:fanf  security  ipmi  power-management  hardware  intel  passwords  bios 
february 2013 by jm
Implementing strcmp, strlen, and strstr using SSE 4.2 instructions - strchr.com
Using new Intel Core i7 instructions to speed up string manipulation. Fascinating stuff. SSE ftw
sse  optimization  simd  assembly  intel  i7  intel-core  strstr  strings  string-matching  strchr  strlen  coding 
january 2013 by jm
AnandTech - The Intel SSD DC S3700: Intel's 3rd Generation Controller Analyzed
Interesting trend; Intel moved from a btree to an array-based data structure for their logical-block address indirection map, in order to reduce worst-case latencies (via Martin Thompson)
latency  intel  via:martin-thompson  optimization  speed  p99  data-structures  arrays  btrees  ssd  hardware 
november 2012 by jm

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