[Patch 0/5] [focal/linux-azure] Enable missing config options

[Khaled Elmously]

Shouldn't the config changes in patches #4 and #5 be annotated? To avoid
losing them again later.

On 2022-04-12 11:20:09 , Tim Gardner wrote:
> BugLink: https://bugs.launchpad.net/bugs/1968749
> 
> [Impact]
> 
> focal/linux-azure is missing a number of config options compared to impish/linux-azure.
> This isonly the first batch to fix some show stoppers. The rest will come with the
> next SRU cycle.
> 
> This kernel is also missing 2 patches that significantly impact network performance.
> 
> From Microsoft:
> =======================================
> 
> We tested this kernel. The P0P1 test cases are finished. Below are we found. P2
> test cases are still running. I will update you when they are finished.
> 
> 1. From dmesg, we can see following lines. Could you check why it has these
> messages and if the messages impact the system?
> [ 3.341802] squashfs: SQUASHFS error: Xattrs in filesystem, these will be ignored
> [ 3.346056] unable to read xattr id index table
> 
> 2. The kernel hasn't backport Michael's SRIOV performance improvement patches. The network performance is not expected.
> Here are the patches:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.18-rc2&id=37200078ed6aa2ac3c88a01a64996133dccfdd34
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.18-rc2&id=8d21732475c637c7efcdb91dc927a4c594e97898
> 
> 3. It is failed to create raid 0 using below command.
> # mdadm --create /dev/md0 --level 0 --raid-devices 16 /dev/sd[abcdghijklmnopqr][1-5]
> mdadm: Defaulting to version 1.2 metadata
> mdadm: RUN_ARRAY failed: Invalid argument
> 
> From dmesg, it has following lines:
> [ 235.830712] md: personality for level 0 is not loaded!
> [ 235.830733] md: md0 stopped.
> 
> I see many raid related configuration is not set. Could you check the raid related and other configuration?
> # cat /boot/config-5.4.0-1076-azure | grep RAID
> CONFIG_RAID_ATTRS=m
> # CONFIG_BLK_DEV_3W_XXXX_RAID is not set
> # CONFIG_SCSI_AACRAID is not set
> # CONFIG_MEGARAID_NEWGEN is not set
> # CONFIG_MEGARAID_LEGACY is not set
> CONFIG_MEGARAID_SAS=y
> # CONFIG_SCSI_PMCRAID is not set
> # CONFIG_MD_RAID0 is not set
> # CONFIG_MD_RAID1 is not set
> # CONFIG_MD_RAID10 is not set
> # CONFIG_MD_RAID456 is not set
> # CONFIG_DM_RAID is not set
> CONFIG_BCM_SBA_RAID=m
> CONFIG_DMA_ENGINE_RAID=y
> CONFIG_RAID6_PQ=m
> CONFIG_RAID6_PQ_BENCHMARK=y
> 
> =======================================
> 
> [Test Case]
> 
> Microsoft tested
> 
> [Where things could go wrong]
> 
> Network performance could suffer.
> There should be little chance of other regressions given that these are config options.
> 
> 
> 
> 
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