21,258 reputation
12347
bio website ripple.com
location Oakland, CA
age 44
visits member for 3 years
seen 3 hours ago

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


May
26
comment Linux cached memory: Over 85% of cached memory and using swap
The idea that swap makes a system slow is entirely false. Your system will use swap only when it is beneficial to do so.
May
25
comment Why drop caches in Linux?
@AaronHall For RAM to provide any benefit, it must be used. It's the RAM your system is using that is improving its performance.
May
22
comment Iperf UDP listening on used port
It's really not clear what you're asking. Are you asking how more specific binds work to allow two applications to bind to the same UDP port? Or are you asking how to troubleshoot a problem with Asterisk? If you want help with a problem, you need to describe the problem to us. All you've done is state one symptom.
May
22
comment In a HP server, can low voltage DIMMS and standard voltage DIMMs be mixed?
It is acceptable if there is some voltage at which both DIMMs are specified to work and you can configure the motherboard to provide that voltage.
May
22
awarded  memory
May
21
comment Switch and ARPxMAC
@kasperd Now that I think about, there's no reason. The source MAC must always be unicast.
May
21
awarded  Good Answer
May
20
awarded  Nice Answer
May
20
comment How can I find my peak bandwidth usage over a period of time?
@TecBrat Those statistics won't help you. Knowing how much bandwidth you used won't tell you how much you needed. (For example, your backups might spike to a very high value just because there's lots of bandwidth between the backup machine and this machine. But the backup performance might be perfectly adequate with 1/10th the bandwidth.) You need to figure out what you need, not what you're using.
May
20
comment Why drop caches in Linux?
@ivcode Then you should find and fix the problem with that server rather than trying to avoid the conditions that cause it. If my car stalled every time I made a sharp right turn, avoiding sharp right turns is a lousy fix.
May
20
answered Why drop caches in Linux?
May
19
answered How to explain to users the difference between Xeon and i7/Consumer CPU
May
14
answered configure single /32 ip address to FreeBSD server
May
14
comment configure single /32 ip address to FreeBSD server
Are you bridging to the VM or routing to it?
May
14
comment configure single /32 ip address to FreeBSD server
Did they assign you a /32 that is already routed on an Ethernet network with some other netmask? Or are they just routing a /32 to you and the machine already has an IP address? In what sense is that IP address associated with a particular physical Ethernet interface? You need to understand how this is supposed to work to configure it correctly. There are multiple possibilities. (A /32 primary makes no sense for Ethernet. What other machine could you ever talk to? No other IP would be on that network.)
May
13
comment The permission to run 'ls' is denied
You're probably going to have to boot from rescue media and fix enough permission to make the system manageable.
May
11
comment Why does the size of a backup differ from Windows Server Backup's snap-in and what's actually on disk?
The only 100% guaranteed way to tell what you have in a backup is to restore it.
May
11
comment Why does the size of a backup differ from Windows Server Backup's snap-in and what's actually on disk?
You probably have a lot of small files. A file with only 3 bytes of data in it still takes up an entire allocation unit in the filesystem ... but not in the backup.
May
11
comment OpenSSL returns different SSL certificate to that shown by Chrome
@Geoffrey I agree. It's the command in the OP that doesn't support SNI.
May
11
comment OpenSSL returns different SSL certificate to that shown by Chrome
I didn't say s_client didn't support CLI. I said the s_client command (in the OP) doesn't.