Reputation
615
Top tag
Next privilege 1,000 Rep.
See votes, expandable usercard
Badges
3 11
Newest
 Yearling
Impact
~44k people reached

  • 0 posts edited
  • 1 helpful flag
  • 238 votes cast
Oct
16
awarded  Popular Question
Feb
22
answered Serving html from linux ramdisk
Mar
2
awarded  Yearling
Feb
16
comment Tuning Linux disk caching behaviour for maximum throughput
@PeterMeyer: Even if you have a lot of RAM it is still a mistake to wait for writes to start. The only time that makes any sense at all is if you are going to be editing or deleting files (like a temporary file) before it would get to disk. A backup does not do that. You want to start background writes as soon as possible. Set your background_ratio to 1 or 2.
Feb
15
comment Tuning Linux disk caching behaviour for maximum throughput
Wouldn't it make more sense to start writing as soon as possible? Otherwise it reaches the maximum buffer size and suddenly comes to a halt. If it was writing all along it gives you more time.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
I added some info about proc mounts to the question.
Dec
13
revised How do I speed up and cache mmap file access over NFS on Linux?
Add details about autofs and proc mounts.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
@DavidSchwartz: Right. Since these are virtual systems there aren't any real local disks. It's all virtual. The "local disk" is a VMware image backed by iSCSI.
Dec
13
comment How do I speed up and cache mmap file access over NFS on Linux?
Sequential read/write runs at 80MB/s per second, so that part of the NFS tuning is okay.
Dec
13
awarded  Student
Dec
13
asked How do I speed up and cache mmap file access over NFS on Linux?
Nov
30
comment In TCP/IP terms, how does a download speed limiter in an office work?
@TessellatingHeckler: The method that I like also enables the use of ECN which actually does tell the sending server to slow down without dropping packets. This method is to apply the rate limiter such as RED to packets leaving on the LAN interface, instead of trying to use an ingress filter on the WAN interface.
Nov
23
comment Networking Units: Not getting expected performance from 100Mb Ethernet
@MarkM: If you look at the reviews of NAS equipment, you will find that 40/20 MB/s is not an unusual speed.
Nov
23
comment Hot spare or extra parity drive in RAID array?
+1: I agree. I see no reason to use RAID-5 when RAID-6 is available. Benchmark the hardware. It should be able to do RAID-6 at full speed, or nearly.
Nov
23
revised Networking Units: Not getting expected performance from 100Mb Ethernet
Fix 10x faster to say faster and can reach the NAS speed.
Nov
23
comment Networking Units: Not getting expected performance from 100Mb Ethernet
@Sirex: Oh well, yes that is true. But the network will be 10x faster.
Nov
23
answered Networking Units: Not getting expected performance from 100Mb Ethernet
Nov
23
comment What happens when a consumer switch receives a VLAN-tagged Ethernet frame?
Eh. Linux end-point devices handle tagged frames just fine. I have seen them do it.
Nov
18
comment Copy large files to multiple machines on a LAN
@user606723: Doesn't everything modern? Maybe some consumer junk does not, but I haven't run into anything with broken multicast in a while. Too much uses it these days. I think Windows Active Directory even uses multicast.
Nov
7
comment What is ECC ram and why is it better?
@JeffAtwood: And, like everyone I am sure, I've occasionally had to reinstall an application (Office. Visual Studio.) because it has apparently gone insane. App bug or ECC error causing a corrupt disk file? Who knows if you don't have ECC?