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5

I don't have data or metric to decide if performance matter in both case. I'll try to explain what background process involving those two cases. When postfix daemon was running, there is little difference between those two When using main.cf, postfix parses the configuration file, save it to memory and doesn't check the file again until postfix restarted ...


3

On latest DELL servers, I found the BIOS-based power saving logic to be quite bad (if not plain broken). Try to disable it, setting the server for maximum performance and to let power saving be under OS control, not BIOS. Then try to re enable hyperthreading.


2

Running a mailing list on a postfix server myself, I expect to see 2,000 messages get processed at least once (i.e. they might be deferred) before you can finish making a cup of coffee. Your system appears to be running spam and virus scans on outgoing mail. While it's a good idea to scan incoming mail, it's probably not so good an idea to scan outgoing ...


1

You problem is I/O speed, as seen by the high CPU WAITING time. This can be due to two factor: postfix queue management is fsync()-rich and impose a heavy load on IOPS terms. Try this: remount the filesystem that hosts postfix's queue (typically the root filesystem) with the "-o nobarrier" mount option. WARNING: this should be considered a test only, as ...


1

On the box itself, you can use vmstat and iostat (part of the sysstat package). vmstat 1 will show you steal, which is the amount of cpu cycles that the hypervisor diverted from the VM to allocate to other VMs. You can also look at iowait, which is the % of cpu cycles spent waiting for I/O to complete. iostat -x -d 1 will show you svctm and await; ...


1

Unfortunately I do not have enough reputation to comment @Dan Pritts post. I have developed a board using Realtek RTL8211E phy chip and I can assure you, that it is able to operate on gigabit speed :) (actually 10/100/1000). The only problem with this phy chip would be if it had not been connected to the CPU using a gigabit interface (like RGMII for ...


1

How about the top's "load average" after some time of doing the speedtest? Does it ever reach 1? If it is not the CPU, maybe something is wrong with some lower layers? I suggest checking if ethtool or mii-tool show 1000FD in both cases (with and without router-in-the-middle). Maybe your router board forces some link settings and maybe you have a duplex ...



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