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Ecc Error Injection

While that might not seem like a high rate, a customer with 12 systems of 32 processors each would on average experience one failure a day. Maybe this is the reason for the unlocking failure. As previously described, while the e-cache uses byte parity, memory uses eight bits of ECC to protect eight bytes. Uncorrectable Ax along with Correctable Ax as both kinds of errors from same location and address has been stored and path of correctable and uncorrectable error indication is different.

Originally published in Queue vol. 8, no. 8-- see this item in the ACM Digital Library Tweet Related: Michael W. Reply Cancel Cancel Reply Suggest as Answer Use rich formatting TI E2E™ Community Support Forums Blogs Videos Groups Site Support & Feedback Settings TI E2E™ Community Groups TI University Program Make share|improve this answer answered Mar 14 at 21:13 albiglan 853710 add a comment| Not the answer you're looking for? So if MEM_CFG_LOCKED is shown set then even if we attempt writing 0x2 to MC_CFG_CONTROL it will not unlock the Memory Controller Control Registers for writes? https://software.intel.com/en-us/forums/software-tuning-performance-optimization-platform-monitoring/topic/516428

If 1) is true but 2) is not, you will see MemTest86 attempt to inject ECC errors ("[ECC Inject]" displayed on screen) but there are no subsequent detected ECC errors. The FM bits do not affect the checking of parity on loads from the e-cache. The command-line interface allowed the user to specify whether the parity error should be injected onto a clean line or a dirty line and whether its detection should be triggered by Uncorrectable Ax followed by Correctable Ax before first error is taken care of.

The system returned: (22) Invalid argument The remote host or network may be down. Interrupts must be disabled for the duration that the LSU.FM is not zero; otherwise, if an interrupt occurs and the interrupt handler (or any code it invokes) performs a store, then The prefetcher is constantly moving instructions from the processor's i-cache (instruction cache) into the processor's instruction buffer. I also want to thank Mike Shapiro and Jim Maurer for reviewing early drafts.

When hardware and software development is divided among different organizations, as it is in the Windows, VMware, and Linux worlds (or, alternatively, the Intel and AMD worlds), exploiting error injection technology The logic proposed is replicated for each memory instance. Wed, 06/18/2014 - 08:44 Thanks for reaching out iliyapolak, I needed to clarify one more thing, is it that if MEMLOCK_STATUS shows the current state as 0x40401 which indicates MEM_CFG_LOCKED is set, (and bits 10 Your cache administrator is webmaster.

Allow snoop activity. (Although we could have confined the setting of FCBV and F_MODE to just the UDB handling the targeted location, it was easier to program them both identically.) Snoop to make sure that the chip doesn’t go outside the safe conditions, which are not met by the design), built-in self-test (to check for permanent failures), efficient fault handling to make This seems to be what is happening in your case. Hardware.

COPYRIGHT © 2010, ORACLE AND/OR ITS AFFILIATES. http://queue.acm.org/detail.cfm?id=1839574 The interface between the processor and the e-cache is 16 bytes wide. Since errors, whether transient or permanent, are a fact of life, the system designers in Oracle's Systems organization (what used to be portions of Sun Microsystems) have developed a layered approach Any errors that remain are solely my responsibility.

As the number of memories increase and number of asynchronous domains increase in the SOC, the overall FIFO size (sum of FIFO sizes required for individual asynchronous memories) becomes very large Comments (newest first) Leave this field empty Post a Comment: Comment: (Required - 4,000 character limit - HTML syntax is not allowed and will be removed) © 2016 ACM, Inc. Load the desired 8-byte chunk into a register; this has the side effect of bringing it into the e-cache if it isn't there already. 5. These reviews are joint meetings of the chip designers and the software people responsible for error handling, diagnosis, and containment.

Data always moves between memory and the CPU subsystem (processor, two UDB chips, and e-cache) in 64-byte blocks, transferred in four 16-byte chunks. Did people in China resort to cannibalism during the reign of Mao? Top Back to original post Leave a Comment Please sign in to add a comment. Injecting a parity error into the e-cache is fairly straightforward.

Since the FCBV field (when used) applies to all data going through the UDB, and since the smallest granule of transfer is 64 bytes, it is impossible to force bad ECC Also, as the chip complexity and size is growing, additional hardware required to meet the safety requirements also grows. They don't always understand the environments in which errors will be injected, however.

This field could be, for example, an 8-bit mask, with one bit for each 8-byte chunk. (One UDB would use the even bits and the other would use the odd bits;

Ensuring that requires testing the various layers, preferably in an end-to-end fashion that imitates the behavior of real errors. Can morse code be called steganography? The cache design used simple byte parity to protect the data, which was sufficient as the amount of charge used to hold a bit was large enough that an ionizing particle This necessitates the need of a scheme that enables generating all scenarios in a generic test case to verify the complete error management logic with all possible corner cases and scenarios

Also the errors are reported centrally in the SoC so that appropriate action can be taken based on which memory has ECC error. Each byte of data is protected by a single parity bit when in the e-cache. ECC (Error Correcting Code) mechanisms not only provide detection of multi-bit errors in data transmission, but are also able to correct smaller bit errors. Brown - Oops!

Download the app from iTunes or Google Play,or view within your browser. Robert Berube in particular did much of the initial coding of the UltraSPARC-II error injector. Uncorrectable Ax followed by Uncorrectable Ay before first error is taken care of. To fix this, there may be an option in the BIOS setup to leave the ECC injection registers unlocked.

Pop up to Fermilab and see what they've got. :) –Michael Hampton♦ Mar 8 at 0:51 4 I'm voting to close this question as off-topic because this is not a So, a lot of work is going on to make sure that safety requirements are met with minimal area overhead. These trends combine to reduce the amount of charge used to represent a bit, increasing the sensitivity of memory to background radiation. We prototyped confining errors that affected only a user program and not the kernel to just that program (a feature that had to wait for the System Management Facility of Solaris

This six-step sequence is used to inject e-cache parity errors at locations corresponding to specific physical memory addresses, kernel virtual addresses, or user virtual addresses. (Virtual addresses are translated to their Each UDB handles eight bytes at a time, converting eight bytes with good ECC into eight bytes with good parity and vice versa. I tried changing the command-line pattern under the ARM compiler in properties to${command} ${flags} ${inputs} --ecc:data_error=0x100,0x01 however I just get an output saying ">> WARNING: invalid compiler option --ecc:data_error=0x100,0x01 (ignored)"Is there Diagnostic access to the cache by the CPU does not interfere with the cache's response to coherency traffic.

A 17th century colloquial term for children, in the way we use 'kids' today How can I get bash/zsh to change some text from "foo.foo.foo" to "foo foo foo" with a The caches of UltraSPARC-II obey this requirement. Contrast this with the Sun Enterprise 10000 system board DTAG (dual tag), which contains a copy of the tag information in the four processors on the system board. Thanks!

Conventional design approach: Usually, memories in SoC work at different frequencies to reduce power consumption or sometimes to meet protocol specifications.

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