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Sep
4
comment What is the “in-the-wire” size of a ethernet frame? 1518 or 1542?
should we get a little more "physical"? en.wikipedia.org/wiki/8b/10b_encoding
Jul
12
comment Tell the linux kernel to put a file in the disk cache?
There is a tool for that: hoytech.com/vmtouch
Jul
1
comment Anyone else experiencing high rates of Linux server crashes during a leap second day?
FYI, blogpost about Google hacking it's ntpd servers to support "seamless" leap second: Time, technology and leaping seconds
Jun
21
comment GPG - why am I encrypting with subkey instead of primary key?
To make long story short: one should never ever encrypt and sign using the same key otherwise bad things will happen (c)
Jun
18
comment freebsd/vsftpd: file size greater 64kb upload not completing
MTU/MSS troubles? Are those troublesome customers behind some kind of PPPoE/PPTP link encapsulation? I suppose next step is to analyze tcpdumps from BOTH sides.
Jun
17
comment freebsd/vsftpd: file size greater 64kb upload not completing
FreeBSD/vsftpd versions would be helpful. Debug logs from vsftpd too. Also first thing to try is to reset all custom sysctls to their default values and if it helps do a bisect.
Jun
13
comment Networking / Multipath dropping
Try dedicating one cpu for dom0
Jun
12
comment Monitoring Linux Kernel Space Processing
perf might be useful: perf.wiki.kernel.org/index.php/Main_Page
May
22
comment Multiple Linux sysadmins working as root
BTW: sshd with LogLevel VERBOSE saves key's fingerprint to logfile
May
21
comment FreeBSD performance tuning: Sysctl parameter, loader.conf, kernel
I've found blog posts and even mailing lists too misleading on most of those tunables. The best source of insight is still source code itself. From now on I'll try to give more information about parameters. Also this is CW, so anyone is free to edit it.
Mar
23
comment Why change net.inet.tcp.tcbhashsize in FreeBSD?
AFAIK, all information for delivering packet to appropriate socket is available via inpcb only.
Mar
23
comment Why change net.inet.tcp.tcbhashsize in FreeBSD?
In my opinion this value should be set somewhat close to number of concurrent connections this server is willing to handle. PS. Do you really want become an expert in some area without reading sources/books? =)
Mar
17
comment How do you manage and deploy FreeBSD's ports in a large environment?
Did you look into portupgrade code? The only it's magic I aware of is moving shared libraries to /usr/local/lib/compat/pkg
Mar
17
comment MySQL performance on FreeBSD after moving db files from /var
Maybe /usr and /var have different block sizes?
Mar
17
comment New kernel compilation on CentOS
I suppose even better way is to make kernel's rpm package and install it.
Mar
15
comment start-stop-daemon freebsd
FreeBSD has daemon(8) utility which provides subset of start-stop-daemon functionality.
Mar
12
comment Htop installation failed
Install kernel sources or use package
Feb
24
comment PHP Warning: PHP Startup: Unable to load dynamic library
Look for grep -r libpcre /usr/local/etc/php* and remove it.
Feb
19
comment FreeBSD ixgbe driver not working
Try compiling driver with #define DEBUG_INIT 1 #define DEBUG_IOCTL 1 #define DEBUG_HW 1. Also boot in VERBOSE mode. Upload dmesg on pastebin.com (or similar).
Feb
16
comment FreeBSD ixgbe driver not working
82599 should be supported by FreeBSD a long time ago. Try searching elsewhere - look at PCI pass-through. Also check if there truly is a link on NIC that you are trying to use (check ixgbe0 and ixgbe1). Also verbose kernel boot would be nice.