[CentOS-devel] dm-cache not caching data on 3.18.21-17.el6.x86_64
Thanos Makatos
thanos.makatos at onapp.comWed Mar 2 15:04:40 UTC 2016
- Previous message: [CentOS-devel] [Cloud SIG] Meeting Thursday, 15:00 UTC
- Next message: [CentOS-devel] AltArch ppc (32-bit) multilib support available
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
I'm evaluating dm-cache on kernels 3.18.21-17.el6.x86_64 (Xen 4) and 2.6.32-573.7.1.el6.x86_64 (KVM). The test I do is a simple sequential read using dd(1). read_promote_adjustment and sequential_threshold have been set to 1 and 0, respectively. For the 2.6.32 kernel, all seems to be working fine, "#usedcacheblocks" correctly reflects the number of cached blocks based on what I'm reading with dd(1) performance is pretty much native SSD performance. However, the same test on the 3.18.21-17.el6.x86_64 kernel results in "#usedcacheblocks" being stuck to "2" and no performance improvement is observed. Any ideas what could be wrong? How can I further debug this? -- Thanos Makatos
- Previous message: [CentOS-devel] [Cloud SIG] Meeting Thursday, 15:00 UTC
- Next message: [CentOS-devel] AltArch ppc (32-bit) multilib support available
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
More information about the CentOS-devel mailing list