From: Bohdan Khomutskyi <bkhomuts@xxxxxxxxxx> I discovered that several kernel configuration options related to SquashFS decompression are set sub-optimally in Fedora. But the optimal configuration is used in RHEL 8. If we set those options to match RHEL, a performance improvement could be achieved while reading from compressed SquashFS filesystem. Please see my original message in Fedora kernel mailing list archive: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx/thread/4M6WYFOZAZYIEVNZTBVM2BTT7SIEZBNQ/ There you can find an excerpt from Linux documentation for the changed options. I found the disparity while working on Fedora change proposal: https://fedoraproject.org/wiki/Changes/OptimizeSquashFS Signed-off-by: Bohdan Khomutskyi <bkhomuts@xxxxxxxxxx> --- .../{ark => common}/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU | 0 .../{ark => common}/generic/CONFIG_SQUASHFS_DECOMP_SINGLE | 0 .../configs/{ark => common}/generic/CONFIG_SQUASHFS_FILE_CACHE | 0 .../configs/{ark => common}/generic/CONFIG_SQUASHFS_FILE_DIRECT | 0 .../configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU | 1 - redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_SINGLE | 1 - redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_CACHE | 1 - redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_DIRECT | 1 - 8 files changed, 4 deletions(-) rename redhat/configs/{ark => common}/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU (100%) rename redhat/configs/{ark => common}/generic/CONFIG_SQUASHFS_DECOMP_SINGLE (100%) rename redhat/configs/{ark => common}/generic/CONFIG_SQUASHFS_FILE_CACHE (100%) rename redhat/configs/{ark => common}/generic/CONFIG_SQUASHFS_FILE_DIRECT (100%) delete mode 100644 redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU delete mode 100644 redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_SINGLE delete mode 100644 redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_CACHE delete mode 100644 redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_DIRECT diff --git a/redhat/configs/ark/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU b/redhat/configs/common/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU similarity index 100% rename from redhat/configs/ark/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU rename to redhat/configs/common/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU diff --git a/redhat/configs/ark/generic/CONFIG_SQUASHFS_DECOMP_SINGLE b/redhat/configs/common/generic/CONFIG_SQUASHFS_DECOMP_SINGLE similarity index 100% rename from redhat/configs/ark/generic/CONFIG_SQUASHFS_DECOMP_SINGLE rename to redhat/configs/common/generic/CONFIG_SQUASHFS_DECOMP_SINGLE diff --git a/redhat/configs/ark/generic/CONFIG_SQUASHFS_FILE_CACHE b/redhat/configs/common/generic/CONFIG_SQUASHFS_FILE_CACHE similarity index 100% rename from redhat/configs/ark/generic/CONFIG_SQUASHFS_FILE_CACHE rename to redhat/configs/common/generic/CONFIG_SQUASHFS_FILE_CACHE diff --git a/redhat/configs/ark/generic/CONFIG_SQUASHFS_FILE_DIRECT b/redhat/configs/common/generic/CONFIG_SQUASHFS_FILE_DIRECT similarity index 100% rename from redhat/configs/ark/generic/CONFIG_SQUASHFS_FILE_DIRECT rename to redhat/configs/common/generic/CONFIG_SQUASHFS_FILE_DIRECT diff --git a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU b/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU deleted file mode 100644 index 123cbd7db973..000000000000 --- a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU +++ /dev/null @@ -1 +0,0 @@ -# CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU is not set diff --git a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_SINGLE b/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_SINGLE deleted file mode 100644 index 5978a504eaec..000000000000 --- a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_DECOMP_SINGLE +++ /dev/null @@ -1 +0,0 @@ -CONFIG_SQUASHFS_DECOMP_SINGLE=y diff --git a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_CACHE b/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_CACHE deleted file mode 100644 index 15b6bd660cf8..000000000000 --- a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_CACHE +++ /dev/null @@ -1 +0,0 @@ -CONFIG_SQUASHFS_FILE_CACHE=y diff --git a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_DIRECT b/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_DIRECT deleted file mode 100644 index 50eff586df28..000000000000 --- a/redhat/configs/fedora/generic/CONFIG_SQUASHFS_FILE_DIRECT +++ /dev/null @@ -1 +0,0 @@ -# CONFIG_SQUASHFS_FILE_DIRECT is not set -- GitLab _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx
