19,884 reputation
11943
bio website ripple.com
location Northern California
age 44
visits member for 2 years, 8 months
seen yesterday

I am Chief Cryptographer at Ripple Labs (formerly OpenCoin) and one of the architects of the Ripple payment system.


Jan
21
comment Why server writes much more than reading the disk
When it's slow, is the CPU maxed? Are one or more cores maxed?
Jan
21
answered Why server writes much more than reading the disk
Jan
21
answered Is recipient's MAC address necessary for TCP connections across the internet?
Jan
17
comment Memory usage reported incorrectly on OpenVZ VPS
@JustinMrkva What makes you think one has anything to do with the other? And what seems incorrect about that memory report? (Your only choices with memory are to use it or to waste it. You can't save it for later. Are you concerned that very little memory is being wasted?)
Jan
17
comment Memory usage reported incorrectly on OpenVZ VPS
What does "it fails" means? What fails? How does it fail? Does it display an error message? What makes you think the problem has anything to do with memory?
Jan
6
comment Collision errors reported by Cisco router interface
Simple rule of thumb: Unless you have a very good reason to do otherwise, do not ever force the speed or duplex on an Ethernet device unless you are certain that the device on the other end has the speed and duplex both forced to precisely the same settings you are forcing your end to. And never, ever force the speed or duplex on Gigabit devices if the connection is copper.
Jan
6
comment Fetching CPU usage and memory leak from the server
You didn't put JmeterPlug.jar in the bin folder.
Jan
6
comment Apache web server maxing out due to processes stuck at D status
How exactly are you using xcache? Do you call xcache_get?
Jan
6
comment Repeating server crashes (IRQ 16?)
Does booting with pci=msi help? What about noirqdebug?
Dec
31
comment How to manage load on OpenVpn server
Punch DMVPN into your favorite search engine.
Dec
31
answered How do I get my memory channel(Single channel, Dual channel, etc) type in Linux?
Dec
30
comment Outgoing SMTP Blocked
Why not just forward all your outbound email to your ISP's mail server and let it deliver for you?
Dec
28
reviewed Reject suggested edit on Get Latest Tag From Subversion
Dec
27
comment SCP corrupted MAC on input
Something is mangling the data inside the TCP packets and correcting the TCP checksums to match it. (Or it's a broken NIC with TCP checksum offload.)
Dec
27
comment TLS connection error on Centos 5.x
Check the date and time settings.
Dec
27
answered top command - cpu from processes do not add up
Dec
27
comment How can I use full 32GB of SSD in my c3.large EC2 instance?
@MarkWagner Whatever instance storage (assuming it's permitted by the instance type) specified in the AMI (or overriden before instance creation) is attached to the instance when it's created. Any storage not attached at creation time is forever inaccessible to the running instance.
Dec
26
comment How can I use full 32GB of SSD in my c3.large EC2 instance?
@MarkWagner He needs to mount it in the first place, which he can't do because it's not attached. You can't attach new instance storage to a running instance.
Dec
26
reviewed Approve suggested edit on How can I use full 32GB of SSD in my c3.large EC2 instance?
Dec
25
answered How can I use full 32GB of SSD in my c3.large EC2 instance?