search for: lowmem_reserve_ratio

....4 kernel to a 2.6.16.29 kernel.org kernel due to some vm problems I was having. All has gone well except that my free memory now sits at 150MB. It does not like to go above or below that. Basically, 150MB of the system's memory is wasted. Andi Kleen suggested that I try tuning /proc/sys/vm/lowmem_reserve_ratio. The problem is that lowmem_reserve_ratio appears to be undocumented. Does anyone here happen to know how it works? The most I've been able to gather is that it sets the ratio of dirty to free pages for each of the memory zones. The default on this server is: 256 256 32 Increasing the thir...

...bytes = 0 vm.dirty_background_ratio = 10 vm.dirty_bytes = 0 vm.dirty_expire_centisecs = 3000 vm.dirty_ratio = 20 vm.dirty_writeback_centisecs = 500 vm.drop_caches = 0 vm.highmem_is_dirtyable = 0 vm.hugepages_treat_as_movable = 0 vm.hugetlb_shm_group = 0 vm.laptop_mode = 0 vm.legacy_va_layout = 0 vm.lowmem_reserve_ratio = 256 32 32 vm.max_map_count = 65530 vm.min_free_kbytes = 3084 vm.mmap_min_addr = 4096 vm.nr_hugepages = 0 vm.nr_overcommit_hugepages = 0 vm.nr_pdflush_threads = 0 vm.overcommit_memory = 0 vm.overcommit_ratio = 50 vm.page-cluster = 3 vm.percpu_pagelist_fraction = 0 vm.scan_unevictable_pages...

Hi everyone, I am seeing slower-than-expected performance in Gluster 3.2.3 between 4 hosts with 10 gigabit eth between them all. Each host has 4x 300GB SAS 15K drives in RAID10, 6-core Xeon E5645 @ 2.40GHz and 24GB RAM running Ubuntu 10.04 64-bit (I have also tested with Scientific Linux 6.1 and Debian Squeeze - same results on those as well). All of the hosts mount the volume using the FUSE