Since upgrading from Linux kernel v4. Post as a guest Name. I would guess this relates to the recent ‘retpoline’ patch to the Linux kernel to address the Spectre vulnerabilities. The chip feature table lists the number of SCBs that can be stored in on-chip memory. Using the SCBs in a straight forward manner would only allow the driver to handle as many concurrent transactions as there are physical SCBs. Since the local SCB space serves as a cache for disconnected transactions, the more SCB space available, the less host bus traffic consumed saving and restoring SCB data.
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Ubuntu 64bit and adaptec raid i2o 1020s Raid controller
A method for aadaptec dual role mode should be provided. I was wondering if anyone was aware of a better remedy for this issue?
It should also acaptec noted Microsemi also provide a precompiled binary for Ubuntu I would guess this relates to the recent ‘retpoline’ patch to the Linux kernel to address the Spectre vulnerabilities. Home Questions Tags Users Unanswered. For systems that store non-volatile settings in a system specific manner rather than a serial eeprom directly connected to the aic7xxx controller, the BIOS must be enabled for the driver to access this information.
Since the local SCB space serves as a cache for disconnected ubunfu, the more SCB space available, the less host bus traffic consumed saving and restoring SCB data. The SCBs for disconnected transactions are only of use to the controller when the transfer is resumed. Post as a guest Name.
I have been informed they are aware of this issue and their engineering team are looking into how to resolve it. Driver features include support for twin and wide busses, fast, ultra or ultra2 synchronous transfers depending on controller type, tagged queueing, SCB paging, and target mode.
Ubuntu Manpage: aac — Adaptec AdvancedRAID Controller driver
Multiplexed Twin Channel Device – One controller servicing two busses. Block Move Instruction Support – Doubles the speed of certain sequencer operations. Tagged Queuing is not supported in target mode. Queuing Registers – Allows queueing of new transactions without pausing the sequencer.
Ubuntu 64bit and adaptec raid i2o s Raid controller
Reselection in target mode fails to function correctly on all high voltage differential boards as shipped by Adaptec.
Using the SCBs in a straight forward manner would only allow ubunty driver to handle as many concurrent transactions as there are physical SCBs. Information on how to modify HVD board to work correctly in target mode is available from Adaptec.
In the mean time their recommendation is to use their pre-compiled Ubuntu binary which is built to work with the linux-image The value assigned to this option should be a bitmap of all units where target mode uubuntu desired. SCB paging takes advantage of the fact that devices usually disconnect from the SCSI bus for long periods of time without talking to the controller.
This confuses the drive and hangs the bus.
To fully utilize the SCSI bus and the devices on it, requires much more concurrency. Otherwise, the state of the most recently disconnected and therefore most likely to stay disconnected SCB is ybuntu, via dma, to host memory, and the local SCB reused to start the new transaction.