21,686 reputation
12449
bio website ripple.com
location Oakland, CA
age 45
visits member for 3 years, 4 months
seen 14 hours ago

I am Chief Cryptographer at Ripple Labs and one of the architects of the Ripple payment system.


Mar
19
comment fast opening and closing connection with a specific port
Your problem is the fact that the connections aren't doing whatever it is they are supposed to be doing.
Mar
19
comment fast opening and closing connection with a specific port
Okay, so what does happen? Does it get an error?
Mar
19
comment fast opening and closing connection with a specific port
It makes no difference. Why do you think this is an issue?
Mar
19
comment fast opening and closing connection with a specific port
No! Why would you want to do something like that?! That's been understood to be a boneheaded thing to do since 1992.
Mar
19
comment fast opening and closing connection with a specific port
What do you mean by "many connections per second"? That question seems to have come out of nowhere. Did you do a netstat twice a few seconds apart and see many connections in the second that weren't in the first? (As the output says, 0.0.0.0:5009 is the LISTENING socket.)
Mar
18
comment Deactivating Cores option in SQL Server 2008
For example, when disk I/O completes, one of the other two cores that SQL Server is not using can handle the completion of the disk I/O, so SQL Server can continue running on two cores while that happens. On a dual-core machine, if SQL Server were using both cores and disk I/O completed, the OS would have to steal one of those two cores from SQL Server to handle the completion of the disk I/O and start the next I/O operation. When SQL Server got the core back, it would find the caches no longer holding its data.
Mar
18
comment Deactivating Cores option in SQL Server 2008
The answer will heavily depend on the CPU. There will be a completely different answer for a quad-core machine as there would be for a dual-core machine with hyper-threading. You tagged this quad-core and are getting the answers for that case. But if your CPU is a dual-core with HT, the answers are not completely accurate.
Mar
18
comment Could high MaxClient value cause CPU load issues no matter actual server stress caused by visits?
That load shortens CPU lifetime is a myth.
Mar
18
comment Using own NS for your domain
Note that if you don't register glue records with your registrar, this will form an unresolvable loop. "How do I find the name server for example.com?" "Ask ns1.example.com or ns2.example.com." "Okay, how do I find the IP address for those so I can ask them?" "Ask the nameserver for example.com." "That's what I wanted to know in the first place!"
Mar
17
comment Have a legitimate ssl certificate, but I fail at installing it
Most likely your crt files are DER, not PEM. Did you look at them? Do they look like PEM? Also, you may be confusing your certificate with the chain certificate. You really should look closely at the certificate files. You can use openssl x509 -text ... to dump the certificate.
Mar
17
answered transfer godaddy domain to linode
Mar
16
comment why is our router crashing?
The P661HW-D1 crashes if you exceed about 900 NAT entries. Clustering downloaders (like Bittorrent) can do this.
Mar
16
comment Nginx+apache2 ubuntu server crashed with several hundreds of visitors
What is the actual problem? What goes wrong? Do you get error messages? Are all the services still running?
Mar
16
comment why is our router crashing?
What's the router model? (P600 describes a series of about 16 routers.)
Mar
15
comment FreeNAS not using all installed RAM
Yeah, that rules out the first two. The third seems kind of unlikely. I think you have a mystery on your hands. Sorry I can't be of more help. Is there anything else odd in the kernel messages?
Mar
15
answered Used memory on Solaris 10
Mar
15
comment linux vlan routing
Do you have a router somewhere to route between these two subnets? How is 192.168.200.20 supposed to be accessed from the 192.168.100.0/24 nework? You say it doesn't work, but don't explain how/why it should work. Does 192.168.200.254 know how to reach 192.168.100.0/24 and 192.168.100.10/24 know how to reach 192.168.200.0/24?
Mar
15
comment cp from Linux to CIFS (windows) share mount is very slow
What are these two computers connected to exactly?
Mar
15
comment FreeNAS not using all installed RAM
I only know of three reasons this happens, and none of them seem likely in your situation. 1) Onboard video controller using the memory. 2) Incorrect BIOS settings making the memory unusable. 3) Kernel memory limitations.
Mar
14
answered Is there a way to limit RAM usage by daemon in Debian?