similar to: Disable checksumming to improve local performance?

Wayne, Transferring an 8gb file using rsync between a network (10GbE) mounted filesystem and local disk. rsync-2.6.9 - 88-95 MB/sec rsync-3.0.6 - 62-72 MB/sec rsync-3.1.0 - 86-90 MB/sec Doing a cp of the file yields 140-160MB/sec. It appears the IO code improvements in 3.1 have definitely made a difference over the 3.0 code base. Greg

In my Linux VM, I am unable to change scatter-gather / tx-checksumming / TCP-segmentation offload features by ethtool command. I am using virtio nic with vhostuser port backend. It shows me an error: Cannot change tx-checksumming Cannot change scatter-gather Cannot change tcp-segmentation offload Could not change any device features Ony running command ethtool -k ens3, I get the following:

Hi all, when running "ethtool -k ethX" on a virtio-net device, it always reports "rx-checksumming: off" with recent kernels. With older kernels (e.g. 2.6.32), it used to report "on" instead, so this difference caused some confusion here ("do newer guest kernels have to compute the RX checksums now? That's certainly a bug / performance problem ...").

Hi all, when running "ethtool -k ethX" on a virtio-net device, it always reports "rx-checksumming: off" with recent kernels. With older kernels (e.g. 2.6.32), it used to report "on" instead, so this difference caused some confusion here ("do newer guest kernels have to compute the RX checksums now? That's certainly a bug / performance problem ...").

On 5/3/19 10:19 AM, Harsh Gondaliya wrote: > In my Linux VM, I am unable to change scatter-gather / tx-checksumming / > TCP-segmentation offload features by ethtool command. I am using virtio nic > with vhostuser port backend. > It shows me an error: > Cannot change tx-checksumming > Cannot change scatter-gather > Cannot change tcp-segmentation offload > Could not change

Hello, I seem to be having some troubles regarding the latest 2.6.31.6 and 2.6.32.9 Xen dom0 pv_ops trees. Our platform: -Xen 3.4.3-rc3 (also tried 3.4.2 on 2.6.31.6 pv_ops dom0) -2.6.32.9 pv_ops dom0 kernel, perhaps a week old checkout from xen/stable git (can provide changeset if requested). -100+ domU''s, all PV. Ever since we switched to a pv_ops dom0 kernel (we were using 2.6.26

Hi R users, I am trying to use the optim function to maximize a likelihood funciton, and I got the following warning messages. Could anyone explain to me what messege 31 means exactly? Is it a cause for concern? Since the value of convergence turns out to be zero, it means that the converging is successful, right? So can I assume that the parameter estimates generated thereafter are reliable MLE

I have a work around for this, but can someone explain why the first example does not work properly? I believed it worked in the previous version of R, by selecting just the rows=200525 and omitting the na's. I just upgraded to 2.13. I am also concern with the row numbers being different in the selections, should I be worried? FYI, I just selected the first few rows for demonstration, please

I just bit the bullet and installed CentOS 5 on my work desktop, and although I have two monitors and a card that supports them, I cannot get the display configuration to work with both as a continuous (spanning) desktop. I have tried using the correct (autodetected) monitor type (digital and analog), a generic LCD with 1280x1024, nothing works. Every time I set the configuration, the X server

Sorry for this dumb question. Suppose I have a named array ww defined as ww <- 1:5 names(ww) <- c("a", "b", "c", "d", "e") How can I extract the whole array of numbers without the names? ww[1:5] does not work while ww[[1]] can only extract one number at a time. Thanks, Gang

Hi everyone, On CentOS 7 I'm running into an issue with the latest nvidia driver from elrepo: kmod-nvidia-384.98-1.el7_4.elrepo.x86_64 This driver version seem to introduce issue in detecting video modes when a monitor is connected using DVI. As soon as the machine attempts to start X, nothing happens and the monitor goes into sleep mode reporting that it has 'no signal'. It is

Hi all, Typically I dont have issues with configuring X. However this time its an issue. I have an NVIDIA graphics card trying to do 1920x1080. If I configure the screen by hand with the nvidia config utility it works at 1920x1080. However when I reboot its 800x600. When I use the nvidia config utility to set 1920x1080 then save the xorg.conf file, and reboot (yes I copied /tmp/xorg.conf to

Hi all. I was reading a sample config someone had posted relating to call forwarding, and in it, they use a Dial command with components that I cannot find any reference to. Can someone point me to a reference which could explain the difference between Dial(SIP/100|20|Ttr,,wW) and Dial(SIP/100,,wW) Specifically, what is the |20|Ttr ? I cannot seem to find any reference which would indicate

I've only been using R on and off for 9 months and started using the glasso package for sparse covariance estimation. I know the concept is to shrink some of the elements of the covariance matrix to zero. However, say I have a dataset that I know has some underlying "baseline" covariance/correlation (say, a value of 0.3), how can I change or incorporate that into to the

https://bugs.freedesktop.org/show_bug.cgi?id=33297 Summary: X hangs with nouveau and linux kernel 2.6.38-rc1 Product: xorg Version: git Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: major Priority: medium Component: Driver/nouveau AssignedTo: nouveau at

This computer is my main desktop machine --- an Intel i7-940 CPU and DX58S0 motherboard with a Radeon X1950 Pro video card. It's currently running Fedora 11 and working just fine. However, I have been slowly moving all of my "computer stuff" off of Fedora and onto Centos, and this (and my Acer Aspire One laptop) are the only Fedora installations that I now have left. Does anyone

I want to pass a predefined string ww ("fa*fb+fc") to function lme so that I can run > lme(y ~ fa*fb+fc, random = ~1|subj, model) I've tried something like > lme(y ~ paste(ww), random = ~1|subj, model) and > lme(y ~ sprintf(ww), random = ~1|subj, model) but both give me the following error: Error in model.frame(formula, rownames, variables, varnames, extras,

On Sunday, January 26, 2020 3:58:31 PM CET Pete Biggs wrote: > > what does Centos 7 do with UPD packets having invalid checksums? > > By default I assume they are just dropped - that's what should happen. Hm that's what thought. > > Are such packets inevitably dropped? > > Applications can specifically disable checksum checking for the kernel > network stack

Hi all, I used bwplot in lattice to create a 6-panel boxplot grouped by a conditioning variable (param) that displays concentration (conc) in response to treatment (trtmnt). Here is the functional part of my code followed by my three questions: library(lattice); ww<-read.csv(file="c:/Rdata/lattice_boxplot_prep.csv",header=TRUE,sep=","); attach(ww);

Hi, I've recently installed FreeBSD 6.3, and I've got a problem with synaptics. I've installed it, followed the pkg-message : hw.psm.synaptics_support=1 It works, dmesg gives : psm0: <PS/2 Mouse> irq 12 on atkbdc0 psm0: [GIANT-LOCKED] psm0: model Synaptics Touchpad, device ID 0 moused_enable="NO" ps shows me that moused doesn't run. xorg.conf : InputDevice