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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 ...


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I had almost the exact same problem, and I found that increasing the memlock and nofile limits on my Ubuntu box dramatically increased performance. For example, append the following to your /etc/security/limits.conf: root soft nofile 100000 root hard nofile 200000 root soft memlock 100000 root hard memlock 200000 In /etc/pam.d/common-session, append: ...


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If you are mounting a network drive that will be slow. Use rsync -aud from windows to linux it will take less than 1 minute after the first run for many TB (assuming neg monthy changes). If you want versioning use rdiff-backup after the rsync. Other options; http://en.m.wikipedia.org/wiki/List_of_backup_software


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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 ...


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I believe that first thing you should do is to stress your proxy to determine its maximum throughput and see if there are any issues like segfaults, memory leaks, how does it scale (if it does), etc. In order to put it under the load you'll need a load testing tool. The best free and open-source options as for now are: Grinder Gatling Tsung Apache ...


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I would bet those are requests from mobile devices, Perf View from FRT isn't showing anything because these requests get stuck on IIS sending the bytes, not in any of those modules/events listed in FRT. See if you can catch one of those in "Current Requests" view in IIS, msdn docs, or alternatively look in the IIS logs, get a bunch of those slow request and ...


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Actually it does. ./configure --help I would not worry about aio in the beginning. I would experiment with it while fine-tuning the server. Anyway you should compile it in. nginx proxy module is one of the essential modules, you should really keep it in. PHP is for parsing PHP script languages, and nginx is the web-server that can work with PHP via fcgi ...


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It's a difficult question. I had a similar choice to do five month ago. We had some R610 connected to an iscsi network (one PS6500 and two PS6000) and we had choose to shut down the san (and iscsi at the same time) using severals R720xd. Why : iscsi is.... we had better read/write latency using servers with sas dd attached. not necessarely more i/o but we ...


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; ...


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.


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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 ...


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Given that the CPU isn't 100% in use, the question becomes what else in the system is limiting performance. My bet is that the ethernet chips just don't have the juice. As per the link in the question, your board uses the Realtek RTL8111E chip. I don't know anything in particular about this chip, but I do know that not all ethernet cards/chips are ...


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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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This thread got me doing my own benchmarks and i found out that Performance varies not just by different cipher/MAC it also makes a difference what data you are sending, which CPU's are involved and how networking is set up. So IMO the right thing to do is run your own tests and find the best settings for your situation. If someone is interested, here are ...


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You really need millisecond latency between your web server and database server, both to speed up the site and reduce load on both servers. Especially so if you use encryption between the two. Which you do; I hope for the sake of your users. If doing this doesn't speed the site up sufficiently enough from Eurpoe to satisfy you, you could look at either ...


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What are some steps I should consider to speed up access in areas that are geographically distant from our servers? Move your server(s) closer. Seriously, there's no rocket science here. In lieu of moving your servers closer, you may consider using a CDN, but depending on the nature of your site, that may or may not make much of a difference.


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Late for this party, but might benefit others, so... Re. cluster size, first and most important, you'd need to look at the distribution of file sizes, so you could optimize for both low fragmentation and disk space waste so you'd resize clusters close to this size, not overall avg - e.g.: if most files fall near 2k, a 2k cluster size would be optimal, if ...



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