search for: 8kb

Some months ago I tried to get some answers (and didn't) for a problem I've had with ov_pcm_total for files 8kb or smaller. I have no idea whether it should make a difference, but I operate inside Visual Studio, with C++ 6.0 and MFC. The value returned by ov_pcm_total doesn't agree with ov_read. My solution had been to add 0.2 to the buffer size, so that ov_read would make it to zero. But now I go wi...

...We''re doing some benchmarking at a customer (using IOzone) and for some specific small block random tests, performance of their X4500 is very poor (~1.2 MB/s aggregate throughput for a 5+1 RAIDZ). Specifically, the test is the IOzone multithreaded throughput test of an 8GB file size and 8KB record size, with the server physmem''d to 2GB. I noticed a couple of peculiar anomalies when investigating the slow results. I am wondering if Sun has any best practices, tips for optimizing small block random I/O on ZFS, or any other documents that might explain what we''re s...

After some help with debugging tips on #dovecot, I have established that a sieve script on Dovecot 1.1.16 has to be less than 8kB in order to be retrieved by a managesieve client. I have been using managesieve for about 6 months over as many 1.1.n versions of dovecot as have been around during that time and hit this problem when I upgraded to Dovecot 1.1.16. I have gone back to Dovecot 1.1.15 and can once again manage my 9k...

...anon:5831 inactive_anon:2 isolated_anon:0 active_file:3833 inactive_file:57589 isolated_file:0 unevictable:1124 dirty:99 writeback:0 unstable:0 free:283729 slab_reclaimable:4785 slab_unreclaimable:2380 mapped:3362 shmem:36 pagetables:1029 bounce:0 Node 0 DMA free:12904kB min:32kB low:40kB high:48kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:12712kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writ...

..._laundry: 0, inactive_clean: 0, free: 3790 ) Dec 7 19:52:43 gcclo77 kernel: aa:0 ac:0 id:0 il:0 ic:0 fr:2927 Dec 7 19:52:43 gcclo77 kernel: aa:157445 ac:1554 id:301 il:0 ic:0 fr:737 Dec 7 19:52:43 gcclo77 kernel: aa:2791 ac:569 id:1 il:0 ic:0 fr:126 Dec 7 19:52:43 gcclo77 kernel: 3*4kB 2*8kB 4*16kB 3*32kB 4*64kB 2*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 2*4096kB = 11708kB) Dec 7 19:52:43 gcclo77 kernel: 49*4kB 0*8kB 0*16kB 0*32kB 1*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 2948kB) Dec 7 19:52:43 gcclo77 kernel: 0*4kB 1*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 0*512...

...kernel: active_file:17836 inactive_file:422075 isolated_file:0 kernel: unevictable:1 dirty:3843 writeback:84236 unstable:0 kernel: free:64174 slab_reclaimable:14968 slab_unreclaimable:35363 kernel: mapped:3896 shmem:77 pagetables:2034 bounce:0 kernel: free_cma:0 kernel: Node 0 DMA free:15836kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15612kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0...

...file:0 [1878432.679700] unevictable:5892 dirty:1004 writeback:0 unstable:0 [1878432.679700] free:2184567 slab_reclaimable:1142980 slab_unreclaimable:86405 [1878432.679700] mapped:754301 shmem:9119 pagetables:21518 bounce:0 [1878432.679700] free_cma:0 [1878432.680007] Node 0 DMA free:15360kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15984kB managed:15360kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetable...

...ver1 kernel: Feb 4 00:08:23 server1 kernel: Free pages: 49280kB (49280kB HighMem) Feb 4 00:08:23 server1 kernel: Active:28662 inactive:196240 dirty:60 writeback:0 unstable:0 free:12320 slab:11019 mapped:9351 pagetables:253 Feb 4 00:08:23 server1 kernel: DMA free:0kB min:16kB low:32kB high:48kB active:36kB inactive:12184kB present:16384kB pages_scanned:0 all_unreclaimable? no Feb 4 00:08:23 server1 kernel: protections[]: 0 0 0 Feb 4 00:08:23 server1 kernel: Normal free:0kB min:936kB low:1872kB high:2808kB active:93152kB inactive:747560kB present:901120kB pages_scanned:0 all_unreclaimabl...

...====================================== Dec 3 15:47:06 HOST1 kernel: Free pages: 17816kB (1664kB HighMem) Dec 3 15:47:06 HOST1 kernel: Active:7463815 inactive:656000 dirty:0 writeback:0 unstable:0 free:4454 slab:119979 mapped:730440 pagetables:63277 Dec 3 15:47:06 HOST1 kernel: DMA free:12448kB min:64kB low:128kB high:192kB active:0kB inactive:0kB present:16384kB pages_scanned:0 all_unreclaimable? yes Dec 3 15:47:06 HOST1 kernel: protections[]: 0 0 0 Dec 3 15:47:06 HOST1 kernel: Normal free:3704kB min:3728kB low:7456kB high:11184kB active:2688kB inactive:2284kB present:901120kB pages_sc...

...on:317858 inactive_anon:24125 isolated_anon:0 active_file:651188 inactive_file:665467 isolated_file:0 unevictable:8 dirty:87 writeback:0 unstable:0 slab_reclaimable:334053 slab_unreclaimable:14431 mapped:105321 shmem:34094 pagetables:8218 bounce:0 free:14592 free_pcp:30 free_cma:0 DMA free:15888kB min:20kB low:24kB high:28kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15980kB managed:15896kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:8kB kernel_stack:0kB...

Hi , i am trying to understand how RED queue discipline works but i am having a few troubles. The parameters are MIN , MAX , LIMIT , BURST I put LIMIT = 64Kb, so if i am not wrong it should PDROP anything over this value , right ? i put MIN = 8Kb , so no drops at all below this value, right ? i put MAX = 16Kb, starts to early drop anything above this using probability P. I put probability at 0.5 [very high , just for test] i PUT burst at 20 [actually , no idea what really put in here] but after a while downloading at full speed i still get...

Hi all, Just watching for my first time the 'oom-killer' call in a CentOS 4.2 workstation. System was running normally but with high load of nice process, iow, rosetta and seti, others appart, nautilus, etc... i realized that after a night of standby running normally, the next moorning after few manual operations from X-session in local console, it started a massive swapping, this time

...unevictable:0 dirty:0 writeback:0 unstable:0 [ 238.351085] slab_reclaimable:5565 slab_unreclaimable:10170 [ 238.351085] mapped:3 shmem:111 pagetables:155 bounce:0 [ 238.351085] free:720717 free_pcp:2 free_cma:0 [ 238.353757] Node 0 active_anon:12484kB inactive_anon:204kB active_file:48kB inactive_file:28kB unevictable:0kB iss [ 238.355979] Node 0 DMA free:11556kB min:36kB low:48kB high:60kB reserved_highatomic:0KB active_anon:152kB inactivB [ 238.358345] lowmem_reserve[]: 0 2955 2884 2884 2884 [ 238.358761] Node 0 DMA32 free:2677864kB min:7004kB low:10028kB high:13052kB re...

...unevictable:0 dirty:0 writeback:0 unstable:0 [ 238.351085] slab_reclaimable:5565 slab_unreclaimable:10170 [ 238.351085] mapped:3 shmem:111 pagetables:155 bounce:0 [ 238.351085] free:720717 free_pcp:2 free_cma:0 [ 238.353757] Node 0 active_anon:12484kB inactive_anon:204kB active_file:48kB inactive_file:28kB unevictable:0kB iss [ 238.355979] Node 0 DMA free:11556kB min:36kB low:48kB high:60kB reserved_highatomic:0KB active_anon:152kB inactivB [ 238.358345] lowmem_reserve[]: 0 2955 2884 2884 2884 [ 238.358761] Node 0 DMA32 free:2677864kB min:7004kB low:10028kB high:13052kB re...

...b kernel: Aug 30 15:46:20 crmdb kernel: Free pages: 16000kB (2560kB HighMem) Aug 30 15:46:20 crmdb kernel: Active:1433949 inactive:40363 dirty:1 writeback:0 unstable:0 free:4 000 slab:24910 mapped:1405036 pagetables:565097 Aug 30 15:46:20 crmdb kernel: DMA free:12544kB min:16kB low:32kB high:48kB active:0kB inactive:0k B present:16384kB pages_scanned:1878896 all_unreclaimable? yes Aug 30 15:46:20 crmdb kernel: protections[]: 0 0 0 Aug 30 15:46:20 crmdb kernel: Normal free:896kB min:928kB low:1856kB high:2784kB active:736kB ina ctive:208kB present:901120kB pages_scanned:1889 all_unreclaimabl...

Hello, I noticed something unusual today. If I "du" a small file (couple of bytes) in CentOS 5, it tells me the file is using 8kb, while I was expecting 4kb which is the block size I'm using. I tried this on several CentOS 5 machines, both x86_64 and i386: $ echo test >test.txt $ ls -l test.txt -rw-rw-r-- 1 filbranden filbranden 5 Mar 11 17:24 test.txt $ du -h test.txt 8.0K test.txt If I do the same on a CentOS 4 ma...

...31:26 tcs kernel: May 31 22:31:26 tcs kernel: Free pages: 3579344kB (3578432kB HighMem) May 31 22:31:26 tcs kernel: Active:96900 inactive:20481 dirty:0 writeback:0 unstable:0 free:894836 slab:212200 mapped:86012 pagetabl es:1438 May 31 22:31:26 tcs kernel: DMA free:16kB min:16kB low:32kB high:48kB active:16kB inactive:0kB present:16384kB May 31 22:31:26 tcs kernel: protections[]: 0 0 0 May 31 22:31:26 tcs kernel: Normal free:896kB min:936kB low:1872kB high:2808kB active:240kB inactive:416kB present:901120kB May 31 22:31:26 tcs kernel: protections[]: 0 0 0 May 31 22:31:26 tcs kernel: HighMe...

...unevictable:0 dirty:0 writeback:0 unstable:0 [ 238.351085] slab_reclaimable:5565 slab_unreclaimable:10170 [ 238.351085] mapped:3 shmem:111 pagetables:155 bounce:0 [ 238.351085] free:720717 free_pcp:2 free_cma:0 [ 238.353757] Node 0 active_anon:12484kB inactive_anon:204kB active_file:48kB inactive_file:28kB unevictable:0kB iss [ 238.355979] Node 0 DMA free:11556kB min:36kB low:48kB high:60kB reserved_highatomic:0KB active_anon:152kB inactivB [ 238.358345] lowmem_reserve[]: 0 2955 2884 2884 2884 [ 238.358761] Node 0 DMA32 free:2677864kB min:7004kB low:10028kB high:13052kB re...

...unevictable:0 dirty:0 writeback:0 unstable:0 [ 238.351085] slab_reclaimable:5565 slab_unreclaimable:10170 [ 238.351085] mapped:3 shmem:111 pagetables:155 bounce:0 [ 238.351085] free:720717 free_pcp:2 free_cma:0 [ 238.353757] Node 0 active_anon:12484kB inactive_anon:204kB active_file:48kB inactive_file:28kB unevictable:0kB iss [ 238.355979] Node 0 DMA free:11556kB min:36kB low:48kB high:60kB reserved_highatomic:0KB active_anon:152kB inactivB [ 238.358345] lowmem_reserve[]: 0 2955 2884 2884 2884 [ 238.358761] Node 0 DMA32 free:2677864kB min:7004kB low:10028kB high:13052kB re...

...1cc/0x66a [<c03f5334>] kbd_init+0x64/0xa0 [<c01175e8>] recalc_task_prio+0x88/0x150 [<c02eeedd>] schedule+0x3bd/0x680 [<c0124929>] sys_alarm+0x39/0x60 [<c0114eb0>] do_page_fault+0x0/0x66a [<c0108c17>] error_code+0x2b/0x30 lowmem_reserve[]: 0 0 0 DMA: 1*4kB 0*8kB 0*16kB 1*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 548kB Normal: empty HighMem: empty Swap cache: add 120470, delete 120465, find 45260/94674, race 0+2 Free swap = 2096316kB Total swap = 2096376kB oom-killer: gfp_mask=0x1d2 DMA per-cpu: cpu 0 hot: low 30, high 90, batch 15 c...