| Author |
Message |
Forum: General Discussion Topic: Why do KVM upgrade? |
| Vance |
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Posted: Sun Dec 13, 2015 9:31 pm
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Replies: 1
Views: 432
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Forum: Performance and Tuning Topic: Can I improve the performance of my VPN? |
| alexfornuto |
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Posted: Tue Nov 24, 2015 6:40 pm
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Replies: 3
Views: 2424
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| The first thing you can do to improve performance is to take the upgrade. Not only will it quadruple your RAM and improve other specs (including networking throughput), it will put you on newer hardware (SSD, KVM). The newer hardware also has better networking. |
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Forum: Sales Questions and Answers Topic: Servers required for performance testing |
| mkorsak |
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Posted: Wed Nov 18, 2015 8:54 am
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Replies: 1
Views: 1084
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| While it is technically possible to run a Windows OS on a Linode now with KVM and our graphical console, it's not a particular easy process, nor is it something we can support. We don't have any guides on it, and it would be more at an at your own risk sort of stance. |
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Forum: Customer Testimonials Topic: Easy deployment, surprisingly low CPU contention—great job! |
| rfeliciano |
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Posted: Fri Oct 16, 2015 11:49 am
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Replies: 1
Views: 2894
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We appreciate that feedback. Our team, particularly the hardware people, work very, very hard to make sure that our plans not only are reasonable in price but provide great performance. When I started using Linode as a customer almost 5 years ago, performance was the first thing I noticed.
Fast-forward to now with KVM Linodes and it's even better.  |
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Forum: General Discussion Topic: booting slackware with GRUB under Linode KVM ? |
| pisti |
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Posted: Sat Aug 29, 2015 3:18 pm
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Replies: 2
Views: 1331
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| Is there anybody out there who got a custom Slackware 14.1 VM running at full-virtualization under KVM Linode and booting with GRUB 2 ? Whatever i do, the GRUB boot results in kernel panic - while unfortunately Lish doesn't provide enough info to get a clue what went wrong early on in the boot process. I have to use a custom kernel & distro because I need to get a 2nd VM (win81) ... ACPI: All ACPI Tables successfully acquired [ 0.019009] ftrace: allocating 36377 entries in 143 pages [ 0.035698] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 [ 0.046856] smpboot: CPU0: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (fam: 06, model: 3f, stepping: 02) [ 0.048644] Performance Events: [ 0.049008] general protection fault: 0000 [#1] SMP [ 0.049919] Modules linked in: [ 0.050000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.17 #2 [ 0.050000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org ... |
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Forum: General Discussion Topic: aes-ni support in kvm linode |
| centminmod |
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Posted: Sun Aug 23, 2015 10:05 pm
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Replies: 3
Views: 1407
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| poti, yup seeing same issue with KVM Xeon E5-2680v3 missing aes flag while Xeon E5-2680v3 KVM has the flag and makes all the difference with 2x performance in openssl speed -evp tests see https://community.centminmod.com/posts/17628/ |
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Forum: Performance and Tuning Topic: Poor PHP benchmark script performance (what's yours?) |
| bryantrv |
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Posted: Sat Aug 01, 2015 9:12 am
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Replies: 11
Views: 6532
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Mine- same server after KVM switch:
Code: --------------------------------------
| PHP BENCHMARK SCRIPT |
--------------------------------------
Start : 2015-08-01 13:10:20
Server : @
PHP version : 5.4.43-1~dotdeb+7.1
Platform : Linux
--------------------------------------
test_math : 1.657 sec.
test_stringmanipulation : 1.625 sec.
test_loops : 1.121 sec.
test_ifelse : 0.783 sec.
--------------------------------------
Total time: : 5.186 sec. |
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Forum: Performance and Tuning Topic: Poor PHP benchmark script performance (what's yours?) |
| madra |
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Posted: Sat Aug 01, 2015 6:00 am
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Replies: 11
Views: 6532
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Late to the party but what the heck. Just ran the script after upgrading from XEN to KVM
Code: --------------------------------------
| PHP BENCHMARK SCRIPT |
--------------------------------------
Start : 2015-08-01 10:56:14
Server : XXXXXXXXXXX
PHP version : 5.6.9-0+deb8u1
Platform : Linux
--------------------------------------
test_math : 1.590 sec.
test_stringmanipulation : 1.452 sec.
test_loops : 0.867 sec.
test_ifelse : 0.495 sec.
--------------------------------------
Total time: : 4.404 sec.
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Forum: Feature Request/Bug Report Topic: Stalls, system instability and reduced performance since upgrade to KVM |
| adeflit |
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Posted: Thu Jul 30, 2015 10:50 am
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Replies: 4
Views: 2085
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| We ran a distro kernel to run Perf Top and that didn't change things. |
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Forum: Feature Request/Bug Report Topic: Stalls, system instability and reduced performance since upgrade to KVM |
| centminmod |
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Posted: Wed Jul 29, 2015 8:15 am
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Replies: 4
Views: 2085
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| what about using distro kernels and not Linode's custom kernels ? any differences ? |
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Forum: Feature Request/Bug Report Topic: Stalls, system instability and reduced performance since upgrade to KVM |
| adeflit |
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Posted: Tue Jul 21, 2015 7:19 am
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Replies: 4
Views: 2085
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| Thank you for posting this. We've also experienced problems with KVM that may relate to yours. We've been in regular contact with Linode Support who are actively working on this. In short, correctly performing KVM nodes perform as well or better than Xen. But we found some KVM hosts perform extremely poorly with our platform. We managed to isolate HHVM as the 'source' of the problem, with the repro cases to 'prove' it. PHP is not affected, which probably explains the lack of KVM complaints. With the help of Linode devs, we ran Perf Top, which shows CPU time being completely consumed by kernel-related tasks: 7.91% [kernel] [k] trigger_load_balance 7.15% [kernel] [k] native_write_msr_safe 5.93% [kernel] [k] timerqueue_add 5.91% [kernel] [k] run_posix_cpu_timers 4.79% [kernel] ... |
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Forum: Feature Request/Bug Report Topic: Stalls, system instability and reduced performance since upgrade to KVM |
| onlyforart |
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Posted: Wed Jul 15, 2015 2:22 am
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Replies: 4
Views: 2085
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| By the way - these Linodes all use Ubuntu 12.04.5 LTS, all patched up weekly to latest versions, always booting with the Linode "latest" 64 bit kernel. |
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Forum: Feature Request/Bug Report Topic: Stalls, system instability and reduced performance since upgrade to KVM |
| onlyforart |
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Posted: Wed Jul 15, 2015 2:02 am
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Replies: 4
Views: 2085
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| ... them, but I am sharing the information since it will be possibility useful to others - and because I want to know how other users have dealt with their own upgrade issues in case it can inform our own plans and indeed help us try again to move to KVM. We run a fleet of ten Linodes in differing sizes to handle workloads ranging from nodejs application servers (8GB and 4GB Linodes) to a 3-Linode TokuMX (a MongoDB fork) database cluster (one 32GB and two 16GB Linodes). These have a heavy 24x5 ... with consistently high levels of network i/o with medium cpu and very low disk i/o for the nodejs servers and medium network i/o, high disk i/o and high cpu for the database cluster. Under Xen all these Linodes offered consistent and reliable performance with very rare downtime (eg only when the host broke). I upgraded these to KVM in three stages: first a development server, then all the application servers, and then the database servers. The application servers started to experience CPU ... |
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Forum: Beta Archive Topic: Poor performance on KVM post-beta |
| adeflit |
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Posted: Fri Jun 19, 2015 10:36 am
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Replies: 3
Views: 1373
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| There is something seriously weird going on. fremont975 (KVM, load medium) is benching at 16rps. fremont973 (KVM, load high) is benching 66rps. |
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Forum: Beta Archive Topic: Poor performance on KVM post-beta |
| adeflit |
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Posted: Fri Jun 19, 2015 2:35 am
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Replies: 3
Views: 1373
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| I noticed that too, but a Xen "medium" performs usually performs as well as an "idle" or "low". I think two of the three KVMs we tested yesterday were also "medium". Unless the scale has changed. |
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