source code for connection establishment

Hi all, I'm a CS student and I'm trying to understand and locate the source code for iSCSI connection establishment. But I encountered the following problem. Could anyone maybe show me where I should go? Any help would be highly appreciated!! 1. I searched in the entire open-iscsi project and

Re: is loopback supported by open-iscsi?

Just tried on another machine the loopback works very well. There must be something I missed in the previous one... Jack On Dec 21, 2:56 pm, Jack Z brianzhang2...@gmail.com wrote: Hi all, I'm working on a loopback with open-iscsi initiator and iscsi enterprise target. I tried using a .img

device on loopback does not show up?

Hi all, I'm working on a loopback with open-iscsi initiator (2.0-871) and iscsi enterprise target(1.4.29). I tried using a .img file and a physical partition on my local hard disk as the target, but the results are the same: When logging in, everything is fine and I can see the successful

iSCSI throughput drops as link rtt increases?

Hi all, I was testing the performance of open-iscsi initiator with IET target over a 100Mbps Ethernet link with emulated rtt. What I did was to do raw disk sequential write by $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 , in which /dev/sdb is the iSCSI device. I also measured TCP

Re: iSCSI throughput drops as link rtt increases?

Hi Pasi, Thank you very much for your reply. I was testing the performance of open-iscsi initiator with IET target over a 100Mbps Ethernet link with emulated rtt.  What I did was to do raw disk sequential write by $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 Did you also try

Re: iSCSI throughput drops as link rtt increases?

not to use the large ones but went with the small ones for some reason... Do you think there might be some configurations I can play with to change this? Thanks a lot! Jack! On Jan 6, 12:03 pm, Mike Christie micha...@cs.wisc.edu wrote: On 01/04/2010 08:54 AM, Jack Z wrote: Then I used Wireshark

Re: iSCSI throughput drops as link rtt increases?

not to use the large ones but went with the small ones for some reason... Do you think there might be some configurations I can play with to have iSCSI and TCP choose to use large segments? Thanks a lot! Jack! On Jan 6, 12:03 pm, Mike Christie micha...@cs.wisc.edu wrote: On 01/04/2010 08:54 AM, Jack

Re: iSCSI throughput drops as link rtt increases?

Hi Pasi, Thank you very much for your help. I really appreciate it! On Jan 5, 12:58 pm, Pasi Kärkkäinen pa...@iki.fi wrote: On Tue, Jan 05, 2010 at 02:05:03AM -0800, Jack Z wrote: Try using some benchmarking tool that can do multiple outstanding IOs.. for example ltp disktest. And I

Re: iSCSI throughput drops as link rtt increases?

Hi Ulrich, Thanks for your reply! I was testing the performance of open-iscsi initiator with IET target over a 100Mbps Ethernet link with emulated rtt.  What I did was to do raw disk sequential write by $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 , in which /dev/sdb is the

iscsi device not showing up...

Hi group, The iSCSI disk just stops showing up on my computer. I'm using open-iscsi again iSCSI Enterprise Target (IET). When I do $ iscsiadm -m node T Target -p Portal --login everything is fine and the login is always successful. I also checked the records in IET, which show the login is

Re: iscsi device not showing up...

On Jan 12, 6:35 pm, Mike Christie micha...@cs.wisc.edu wrote: On 01/12/2010 06:51 PM, Jack Z wrote: Hi group, The iSCSI disk just stops showing up on my computer. I'm using open-iscsi again iSCSI Enterprise Target (IET). When I do $ iscsiadm -m node TTarget  -pPortal  --login

how does the user-land code tell the kernel-land code about the parameters?

Hi all, I have been tracing the initiator code (ver 2.0.871) and trying to understand: How does user-land code talk to the kernel-land code about the parameter settings, if they are not using the default value? Say, a larger node.conn[0].iscsi.MaxRecvDataSegmentLength? As I trace the code, I

Re: explanation of some pieces of code?

 am, Ulrich Windl ulrich.wi...@rz.uni- regensburg.de wrote: On 27 Jan 2010 at 9:59, Jack Z wrote: Hi Ulrich, Thanks for your comment. So by implement polymorphism, do you mean sk-sw_write_space is platform dependent or it does different jobs when called from different functions

Re: kernel call trace after successfully logging into our portal

By offline, did you mean the disk was offline on the target side? if so, do you know what type of target you're using open-iscsi against? If that is iscsi enterprise target, you can edit the configure file / etc/ietd.conf on the target side properly and restart the target service by

Re: scatterlist size of 4096

, Jack Z wrote: Hi group, I have been tracing the code related to sending PDUs from iscsi initiator (ver 2.0-871). And through some printk()s i realize that starting from iscsi_sw_tcp_pdu_init(), all the functions using scatterlist (struct scatterlist *sg) seem to use 4096

Re: scatterlist size of 4096

, say we copy a few pages to one buffer fist and then send them at one time? Thanks a lot! Jack On May 5, 9:26 pm, Jack Z brianzhang2...@gmail.com wrote: Hi Mike, Thank you for your help again. Following the guidance in your reply, I traced the kernel code a bit more and eventually found out

Re: scatterlist size of 4096

to send more than one sg entries per at one time, say we copy a few pages to one buffer fist and then send out that buffer through sendpage()? Thank you very much. Jack On May 6, 3:08 pm, Mike Christie micha...@cs.wisc.edu wrote: On 05/06/2010 03:53 PM, Jack Z wrote: Hi Mike, Thanks for your