Re: rawhide ext4/virtio FS performance hit (10x slower) ?
On 05/13/2012 12:00 AM, Reindl Harald wrote: how can someone find out if it is a debug-kernel? even the satble ones seems to have a ton of debug options enabled especially "CONFIG_DEBUG_KERNEL=y" See http://fedoraproject.org/wiki/KernelDebugStrategy to find what kernel config options to look for. Michal -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
On Sun, May 13, 2012 at 00:00:24 +0200, Reindl Harald wrote: Am 12.05.2012 23:38, schrieb drago01: I've just rerun the test with 3.4.0-0.rc6.git1.1.fc18.x86_64, This one has debug options enabled; 3.4.0-0.rc6.git0.1 is the one without debug options. how can someone find out if it is a debug-kernel? even the satble ones seems to have a ton of debug options enabled especially "CONFIG_DEBUG_KERNEL=y" You can look at the changelog for the build. Current practice is that the first build for a particular rc is a nodebug build. The package set is also different. The debug builds don't include an update of kernel-doc. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
Am 12.05.2012 23:38, schrieb drago01: >> I've just rerun the test with 3.4.0-0.rc6.git1.1.fc18.x86_64, > > This one has debug options enabled; 3.4.0-0.rc6.git0.1 is the one > without debug options. how can someone find out if it is a debug-kernel? even the satble ones seems to have a ton of debug options enabled especially "CONFIG_DEBUG_KERNEL=y" [root@srv-rhsoft:/boot]$ cat config-3.3.5-2.fc16.x86_64 | grep -i debug | grep "=y" CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y CONFIG_SLUB_DEBUG=y CONFIG_HAVE_DMA_API_DEBUG=y CONFIG_XEN_DEBUG_FS=y CONFIG_X86_DEBUGCTLMSR=y CONFIG_PM_DEBUG=y CONFIG_PM_ADVANCED_DEBUG=y CONFIG_CFG80211_DEBUGFS=y CONFIG_MAC80211_DEBUGFS=y CONFIG_DEBUG_DEVRES=y CONFIG_CB710_DEBUG_ASSUMPTIONS=y CONFIG_IWMC3200TOP_DEBUGFS=y CONFIG_DM_DEBUG=y CONFIG_FIREWIRE_OHCI_DEBUG=y CONFIG_MLX4_DEBUG=y CONFIG_ATH5K_DEBUG=y CONFIG_ATH9K_DEBUGFS=y CONFIG_ATH6KL_DEBUG=y CONFIG_IWLWIFI_DEBUG=y CONFIG_IWLWIFI_DEBUGFS=y CONFIG_IWLEGACY_DEBUG=y CONFIG_IWLEGACY_DEBUGFS=y CONFIG_RT2X00_LIB_DEBUGFS=y CONFIG_SND_DEBUG=y CONFIG_SND_PCM_XRUN_DEBUG=y CONFIG_INFINIBAND_MTHCA_DEBUG=y CONFIG_INFINIBAND_IPOIB_DEBUG=y CONFIG_INFINIBAND_IPOIB_DEBUG_DATA=y CONFIG_DRM_NOUVEAU_DEBUG=y CONFIG_DLM_DEBUG=y CONFIG_DEBUG_FS=y CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_SHIRQ=y CONFIG_SCHED_DEBUG=y CONFIG_DEBUG_BUGVERBOSE=y CONFIG_DEBUG_INFO=y CONFIG_DEBUG_VM=y CONFIG_DEBUG_MEMORY_INIT=y CONFIG_DEBUG_LIST=y CONFIG_DYNAMIC_DEBUG=y CONFIG_DEBUG_STACKOVERFLOW=y CONFIG_DEBUG_RODATA=y CONFIG_DEBUG_RODATA_TEST=y CONFIG_DEBUG_SET_MODULE_RONX=y CONFIG_DEBUG_BOOT_PARAMS=y CONFIG_KEYS_DEBUG_PROC_KEYS=y signature.asc Description: OpenPGP digital signature -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
On Sat, May 12, 2012 at 11:04 PM, Jim Meyering wrote: > Josh Boyer wrote: > >> On Mon, May 7, 2012 at 8:43 AM, Jim Meyering wrote: >>> Today I noticed that some tests from coreutils' test suite >>> were taking far longer than they used to on rawhide. >>> For example, run this command in an empty directory: >>> >>> seq 20|env time xargs touch >>> >>> it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet >>> it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD >>> >>> 10x performance hit... ouch. >>> >>> Does anyone know why? >> >> Rawhide has all the kernel debug options turned on. It isn't >> worthwhile doing a comparison when those are enabled. You could try >> again with the first -rc6 build that shows up, as that will have the >> options disabled. > > Hi Josh, > > I've just rerun the test with 3.4.0-0.rc6.git1.1.fc18.x86_64, This one has debug options enabled; 3.4.0-0.rc6.git0.1 is the one without debug options. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
Josh Boyer wrote: > On Mon, May 7, 2012 at 8:43 AM, Jim Meyering wrote: >> Today I noticed that some tests from coreutils' test suite >> were taking far longer than they used to on rawhide. >> For example, run this command in an empty directory: >> >> seq 20|env time xargs touch >> >> it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet >> it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD >> >> 10x performance hit... ouch. >> >> Does anyone know why? > > Rawhide has all the kernel debug options turned on. It isn't > worthwhile doing a comparison when those are enabled. You could try > again with the first -rc6 build that shows up, as that will have the > options disabled. Hi Josh, I've just rerun the test with 3.4.0-0.rc6.git1.1.fc18.x86_64, and it takes just as long, so the hit is *not* due to debug options: $ seq 20|env time xargs touch 0.17user 41.98system 0:48.22elapsed 87%CPU (0avgtext+0avgdata 1424maxresident)k 88inputs+0outputs (0major+4502minor)pagefaults 0swaps -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
Josh Boyer wrote: > On Mon, May 7, 2012 at 8:43 AM, Jim Meyering wrote: >> Today I noticed that some tests from coreutils' test suite >> were taking far longer than they used to on rawhide. >> For example, run this command in an empty directory: >> >> seq 20|env time xargs touch >> >> it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet >> it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD >> >> 10x performance hit... ouch. >> >> Does anyone know why? > > Rawhide has all the kernel debug options turned on. It isn't > worthwhile doing a comparison when those are enabled. You could try > again with the first -rc6 build that shows up, as that will have the > options disabled. Thanks. Will do. I knew about the kernel debug options, but didn't realize they could make such a large difference. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: rawhide ext4/virtio FS performance hit (10x slower) ?
On Mon, May 7, 2012 at 8:43 AM, Jim Meyering wrote: > Today I noticed that some tests from coreutils' test suite > were taking far longer than they used to on rawhide. > For example, run this command in an empty directory: > > seq 20|env time xargs touch > > it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet > it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD > > 10x performance hit... ouch. > > Does anyone know why? Rawhide has all the kernel debug options turned on. It isn't worthwhile doing a comparison when those are enabled. You could try again with the first -rc6 build that shows up, as that will have the options disabled. josh -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
rawhide ext4/virtio FS performance hit (10x slower) ?
Today I noticed that some tests from coreutils' test suite were taking far longer than they used to on rawhide. For example, run this command in an empty directory: seq 20|env time xargs touch it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD 10x performance hit... ouch. Does anyone know why? -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
