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I found the problem this morning. Cpus were scaled down to 800Mhz instead of 3.5G I got this line on syslog but I don't know what can cause this. kernel: [9486277.982336] perf: interrupt took too long (5026 > 5011), lowering kernel.perf_event_max_sample_rate to 39750

I have bad performances on my server since several days. mysql requests are very slow, even my vm backups are twice longer. However the resources are not saturated. I checked proxmox performances with pveperf and I had the following results : CPU BOGOMIPS: 55998.56 REGEX/SECOND...