Re: How to avoid packet drop
> I am running a tool that is a packet generator. > With that tool i am able to achieve line/link rate on my 1Gbps network. > I have two queries > > Query 1) When i run the same tool on 10Gbps network i am able to achieve > only 5Gbps rate.( by network i mean i have two machines with Centos 6.4 > connected back to back.) > If your question is why you are not able to get line rate on 10 Gb interface, try faster machines. Dell T110 can do line rate easily and Dell T620 can do 2 line rates (for 10 Gb) simultaneously Query 2) When i run the packet generator on the 1Gbps link or 10Gbps link i > see a packet drop by kernel ( result of tcpdump -i eth2).How can i minimize > the packet drop? > If you are referring to packet drop by tcpdump (when you ctrl-c it), this packet is not dropped by kernel stack, but by tcpdump filter. For packets dropped by stack you can look at sats in /proc or look in ifconfig for packets dropped by the hardware. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
i2c_add_driver and i2c_new_device handling
Hi, I am writting a driver to control an i2c device. Is it possible to call 'i2c_add_driver' and 'i2c_new_device' back to back from module init function? Currently i am getting error 'Bug scheduling while atomic' on calling i2c_new_device. Any pointer to debug furthe will be very helpful. Thanks, Chetan Nanda ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: kexec
Sorry, silly question, but did you try as root? kexec load tries to put the knew kernel on memory and after that tries a syscall to kexec_load to finish with a kexec_reboot, since it handles with mem and syscalls maybe just as a root you will run it properly Also have that ke...@lists.infradead.org list. []'s On Thu, Oct 3, 2013 at 10:05 AM, Dmitry Kolesov wrote: > Hello. > > Could anybody help with kexec. I cannot find some informaton from google. > I try to use kexec for fast boot new kernel but I have error below: > > # kexec -l /boot/vmlinuz-3.12.0-rc1+ > --initrd=/boot/initramfs-3.12.0-rc1+.img --command-line="$(cat > /proc/cmdline)" > kexec_load failed: Operation not permitted > entry = 0x24eff5790 flags = 3e > nr_segments = 3 > segment[0].buf = 0x7fd169783210 > segment[0].bufsz = 505250 > segment[0].mem = 0x24d00 > segment[0].memsz = 1413000 > segment[1].buf = 0xbc3770 > segment[1].bufsz = 4310 > segment[1].mem = 0x24efef000 > segment[1].memsz = 5000 > segment[2].buf = 0xbba650 > segment[2].bufsz = 90e0 > segment[2].mem = 0x24eff5000 > segment[2].memsz = b000 > > KEXEC option in the config is enabled. > > How can I decid this problem? > > Regards, > Dmitry > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- -- Leônidas S. Barbosa (Kirotawa) ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
RE: [PCIe spec question] How to get PCI express link up / link down notifications?
Hi, I found the answer to my original question. I found the "Data Link Layer State Changed Enable" bit in the Slot Control register which seems to provide interrupt on link state changes. 6.7.3.3. Data Link Layer State Changed Events == The Data Link Layer State Changed event provides an indication that the state of the Data Link Layer Link Active bit in the Link Status register has changed. Support for Data Link Layer State Changed events and software notification of these events are required for hot-plug capable Downstream Ports. If this event is supported, the Port sets the status field associated with the event 5 when the value in the Data Link Layer Link Active bit changes. Thanks a bunch! Rajat ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
How to avoid packet drop
Hi All, I am running a tool that is a packet generator. With that tool i am able to achieve line/link rate on my 1Gbps network. I have two queries Query 1) When i run the same tool on 10Gbps network i am able to achieve only 5Gbps rate.( by network i mean i have two machines with Centos 6.4 connected back to back.) Query 2) When i run the packet generator on the 1Gbps link or 10Gbps link i see a packet drop by kernel ( result of tcpdump -i eth2).How can i minimize the packet drop? Thanks Clove ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
