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Comment: Re:Bulldozer Cores are not that Great (Score 1) 189

by mestlick (#38052022) Attached to: First 16-Core Opteron Chips Arrive From AMD

There are a few big mistakes about Bulldozer here.

The FP is completely shared between the integer clusters. The FP is 4-wide and the two clusters compete for all the resources in the FP.

Each Bulldozer integer cluster is 4-wide. The shared instruction fetch is also 4-wide.

Sandy Bridge has 168 instructions in flight and Bulldozer has 128 per cluster. Sandy Bridge has a combined FP/INT scheduler with 54 entries. Bulldozer has separate schedulers with 40 INT per cluster and 60 FP entries.

You are correct about BDs Achilles heal. The L2 and L3 latencies are longer than SB. I think the solution is to reduce the latencies, not increase the in flight window size.

Image

Facebook Master Password Was "Chuck Norris" 319

Posted by samzenpus
from the ad-nauseum-roundhouse dept.
I Don't Believe in Imaginary Property writes "A Facebook employee has given a tell-all interview with some very interesting things about Facebook's internals. Especially interesting are all the things relating to Facebook privacy. Basically, you don't have any. Nearly everything you've ever done on the site is recorded into a database. While they fire employees for snooping, more than a few have done it. There's an internal system to let them log into anyone's profile, though they have to be able to defend their reason for doing so. And they used to have a master password that could log into any Facebook profile: 'Chuck Norris.' Bruce Schneier might be jealous of that one."
Open Source

Linux Kernel 2.6.32 Released 195

Posted by CmdrTaco
from the download-compile-reboot-repeat dept.
diegocg writes "Linus Torvalds has officially released the version 2.6.32 of the Linux kernel. New features include virtualization memory de-duplication, a rewrite of the writeback code faster and more scalable, many important Btrfs improvements and speedups, ATI R600/R700 3D and KMS support and other graphic improvements, a CFQ low latency mode, tracing improvements including a 'perf timechart' tool that tries to be a better bootchart, soft limits in the memory controller, support for the S+Core architecture, support for Intel Moorestown and its new firmware interface, run-time power management support, and many other improvements and new drivers. See the full changelog for more details."

Air pollution is really making us pay through the nose.

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