search for: kswapd

Hi All I have xeon server with 16 Gb Ram and no Swap memory.I am running cassandra server on two node in cluster.When there is high load on server kswapd0 kicks inn and take 100% cpu and make machine very slow and we need to restart out cassandra server.I have latest kernel 2.6.18-238.9.1.el5.Please let me know how can i fix this issue .Its hurting us badly this our production server any quick help will be appreciated. -- S.Ali Ahsan

...nks. > > > I plan to let free page allocation stop when the remaining system free > > memory becomes close to min_free_kbytes (prevent swapping). > > ~__GFP_RECLAIM will make sure you are allocate as long as there is any > memory without reclaim. It will not even poke the kswapd to do the > background work. So I do not think you would need much more than that. "close to min_free_kbytes" - I meant when doing the allocations, we intentionally reserve some small amount of memory, e.g. 2 free page blocks of "MAX_ORDER - 1". So when other applications ha...

...e rsync to sync images from a main image box. It runs fine for maybe 4 days untill all memory is in cache, and like 7MB of physical memory is free. The box will hardly do anything, and cache will just keep going up and up untill no more memory is free. Then when I run rsync (a memory hog) at night, kswapd and rsync will compete with each other and send the cpu load through the roof. Funny thing is the box won't really use swap at all. Then while the box is rsyncing I cant even do simple things like SSH to the box. Why did older kernels (2.2 kernels) work a whole lot better. Did older kernels swa...

...t iput+0x25/0x61 Sep 3 04:03:10 qu015 kernel: eax: 00000040 ebx: f3a85b74 ecx: f8c7bbb9 edx: f3a85b74 Sep 3 04:03:10 qu015 kernel: esi: f222b89c edi: f222b8a4 ebp: 0000006b esp: f7ceeeec Sep 3 04:03:10 qu015 kernel: ds: 007b es: 007b ss: 0068 Sep 3 04:03:10 qu015 kernel: Process kswapd0 (pid: 43, threadinfo=f7cee000 task=f7d1b7b0) Sep 3 04:03:10 qu015 kernel: Stack: f3a85b74 c016a1d8 00000000 00000092 00000000 f7ffe9e0 c016a553 c0144e2c Sep 3 04:03:10 qu015 kernel: 00d70a00 00000000 00000061 00000000 00023313 000000d0 00000020 c031ad80 Sep 3 04:03:10 qu015 kernel:...

...own. Also, there are no indications in gluster.log as to what this may have caused. We're running Gluster 3.2.1 from debian packages provided. The things I've tried are: using an older version of the kernel (lenny backports) than squeeze, and disabling swap (since the process that oopses is kswapd), the solution currently being tried is using nfs for high load hosts, I hope this doesn't crash the gluster server :). This mail is more of a JFYI than a bug report - perhaps somebody else has seen this problem too and can provide more insight. Dec 2 19:46:50 hn-r410-openvz01 kernel: [ 9903....

On 07/11/2018 05:21 PM, Michal Hocko wrote: > On Tue 10-07-18 18:44:34, Linus Torvalds wrote: > [...] >> That was what I tried to encourage with actually removing the pages >> form the page list. That would be an _incremental_ interface. You can >> remove MAX_ORDER-1 pages one by one (or a hundred at a time), and mark >> them free for ballooning that way. And if you

On 07/11/2018 05:21 PM, Michal Hocko wrote: > On Tue 10-07-18 18:44:34, Linus Torvalds wrote: > [...] >> That was what I tried to encourage with actually removing the pages >> form the page list. That would be an _incremental_ interface. You can >> remove MAX_ORDER-1 pages one by one (or a hundred at a time), and mark >> them free for ballooning that way. And if you

...ing files, now the maximum used space is around 76%) - once I'd cleaned up the file-system the system ran fine until the first error was reported at 15:50 on Thursday (as shown above), and then Friday (last night) it just went haywire. The only other thing to note is that there was a panic on kswapd a number of hours earlier - but I've seen these on other systems running 2.4.18 and they don't seem to cause any problems (I think). As I've mentioned I've seen the same behavior before on other systems, the specs for all of them are: Abit ST6 Motherboard with 1.2 Gig Celeron 2...

Is anyone using Ext3 on a 2.4.x kernel with software raid5? Does it work correctly? Last I checked noone had tried it yet, but that was before I went away on vacation. -- Daniel R. Bidwell | bidwell@andrews.edu Andrews University Information Technology Services If two always agree, one of them is unnecessary "Friends don't let friends do DOS" "In theory, theory and practice

...E COMMAND root 1 0.0 0.0 1368 72 ? S Aug27 0:05 init [3] root 2 0.0 0.0 0 0 ? SW Aug27 0:00 [keventd] root 3 0.0 0.0 0 0 ? SWN Aug27 0:00 [ksoftirqd_CPU0] root 4 0.0 0.0 0 0 ? SW Aug27 0:03 [kswapd] root 5 0.0 0.0 0 0 ? SW Aug27 0:00 [kreclaimd] root 6 0.0 0.0 0 0 ? DW Aug27 0:00 [bdflush] root 7 0.0 0.0 0 0 ? DW Aug27 0:00 [kupdated] root 9 0.0 0.0 0 0 ? SW< Aug27 0:00 [mdrecover...

On Wed, 2014-01-08 at 21:18 +0200, Michael S. Tsirkin wrote: > On Wed, Jan 08, 2014 at 10:26:03AM -0800, Eric Dumazet wrote: > > On Wed, 2014-01-08 at 20:08 +0200, Michael S. Tsirkin wrote: > > > > > Eric said we also need a patch to add __GFP_NORETRY, right? > > > Probably before this one in series. > > > > Nope, this __GFP_NORETRY has nothing to do

On Wed, 2014-01-08 at 21:18 +0200, Michael S. Tsirkin wrote: > On Wed, Jan 08, 2014 at 10:26:03AM -0800, Eric Dumazet wrote: > > On Wed, 2014-01-08 at 20:08 +0200, Michael S. Tsirkin wrote: > > > > > Eric said we also need a patch to add __GFP_NORETRY, right? > > > Probably before this one in series. > > > > Nope, this __GFP_NORETRY has nothing to do

...ing since 3:30 and was half-way completed (estimated by the 'p' in the uername). Also there were 32 nfsd's just like this: root 851 0.0 0.0 0 0 ? DW Jun19 4:35 [nfsd] and these, the other 4 kjournald's were in SW. root 7 0.1 0.0 0 0 ? DW Jun19 17:04 [kswapd] root 144 0.0 0.0 0 0 ? DW Jun19 6:53 [kjournald] I'm wondering what my options are, this has happened ~10 times in the last 6 months, although the system went a period of ~120 days without a hiccup. This last time on 2.4.21-ac1 was only 6 days. It wouldn't be so bad if a `...

...[<c01050ea>] do_IRQ+0x48/0x52 [<c0103692>] common_interrupt+0x1a/0x20 [<c016e3cb>] dput+0x1a/0x119 [<c016e551>] prune_one_dentry+0x68/0x74 [<f881b2ea>] mb_cache_shrink_fn+0x1d/0xb5 [mbcache] [<c01491a3>] shrink_zone+0xaf/0xd0 [<c014962c>] kswapd+0x295/0x399 [<c012dbb1>] autoremove_wake_function+0x0/0x2d [<c0149397>] kswapd+0x0/0x399 [<c012dae3>] kthread+0xc2/0xef [<c012da21>] kthread+0x0/0xef [<c0101005>] kernel_thread_helper+0x5/0xb and for 2.6.17-2-k7: f0872d73 Modules linked in: ipv6 ip...

.../tmp fail - if I even do ls /tmp the command will hang. I suspect kjournald because of the following ps output: PID PPID WCHAN:20 PCPU %MEM PSR COMM 8847 99 start_this_handle 1.1 0.0 28 pdflush 8853 99 schedule_timeout 0.2 0.0 7 pdflush 188 1 kswapd 0.0 0.0 19 kswapd0 8051 1 mtd_blktrans_thread 0.0 0.0 22 mtdblockd 8243 1 kjournald 0.0 0.0 0 kjournald 8305 1 schedule_timeout 0.0 0.0 2 udevd 8378 1 kjournald 0.0 0.0 0 kjournald 8379...

...ad +0x26/0x42 [jbd] Apr 25 11:29:25 amd kernel: eax: 1e14ae0f ebx: cc9e5284 ecx: 7c4ad439 edx: cc9e5284 Apr 25 11:29:25 amd kernel: esi: c1114300 edi: 00000000 ebp: c89e5284 esp: f7cfee24 Apr 25 11:29:25 amd kernel: ds: 007b es: 007b ss: 0068 Apr 25 11:29:25 amd kernel: Process kswapd0 (pid: 51, threadinfo=f7cfe000 task=f7d276f0) Apr 25 11:29:25 amd kernel: Stack: f888d9f0 00000000 f7ec5a00 f88c44d3 000000d0 f3c4f678 f7cfef58 c015d323 Apr 25 11:29:25 amd kernel: f3c4f678 c1114300 c0149c7f 00000001 00000001 00000010 00000000 f7cfeec8 Apr 25 11:29:25 amd kernel:...

...ges on OOM. We continue to use this > feature bit for the shrinker, so the shrinker is only registered when > this feature bit has been negotiated with host. Do you have any numbers for how does this work in practice? Let's say you have a medium page cache workload which triggers kswapd to do a light reclaim? Hardcoded shrinking sounds quite dubious to me but I have no idea how people expect this to work. Shouldn't this be more adaptive? How precious are those pages anyway? -- Michal Hocko SUSE Labs

...ges on OOM. We continue to use this > feature bit for the shrinker, so the shrinker is only registered when > this feature bit has been negotiated with host. Do you have any numbers for how does this work in practice? Let's say you have a medium page cache workload which triggers kswapd to do a light reclaim? Hardcoded shrinking sounds quite dubious to me but I have no idea how people expect this to work. Shouldn't this be more adaptive? How precious are those pages anyway? -- Michal Hocko SUSE Labs

...t; > > > > > > Nope, see this: > > > > > > > > if (SKB_FRAG_PAGE_ORDER && > > > > !static_branch_unlikely(&net_high_order_alloc_disable_key)) { > > > > /* Avoid direct reclaim but allow kswapd to wake */ > > > > pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | > > > > __GFP_COMP | __GFP_NOWARN | > > > > __GFP_NORETRY, > > > >...

...mod usbhid hid sd_mod sr_mod cdrom crc_t10dif ata_generic thermal tg3 firewire_ohci thermal_sys ahci libahci ata_piix sdhci_pci sdhci mmc_core uhci_hcd libphy firewire_core crc_itu_t libata ehci_hcd scsi_mod usbcore usb_common [last unloaded: iwl3945] [34736.234950] [34736.234966] Pid: 23, comm: kswapd0 Not tainted 3.4.0 #2 Dell Inc. XPS M1330 /0N6705 [34736.235036] RIP: 0010:[<ffffffffa01ec2a8>] [<ffffffffa01ec2a8>] btrfs_release_extent_buffer_page.constprop.37+0x49/0xc5 [btrfs] [34736.235156] RSP: 0018:ffff880116fff9e0 EFLAGS: 00010286 [34736.235194] RAX: f...